GLDR

{{
  "language": "Solidity",
  "sources": {
    "GLDR.sol": {
      "content": "/**
GOLDRUSH - Your Digital Gold Mine

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Earn Gold, Just For Holding
**/

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;

import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IDEXFactory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IDEXRouter {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
}

interface IDividendDistributor {
    function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution, uint256 _minHoldForDividends) external;
    function setShare(address shareholder, uint256 amount) external;
    function deposit(uint256 amount) external;
    function process(uint256 gas) external;
    function claimDividend() external;
    function getUnpaidEarnings(address shareholder) external view returns (uint256);
}

contract DividendDistributor is IDividendDistributor {
    using SafeMath for uint256;
    
    struct Share {
        uint256 amount;
        uint256 totalExcluded;
        uint256 totalRealised;
    }
    
    IERC20 public immutable rewardToken;
    address public immutable token;
    
    address[] public shareholders;
    mapping (address => uint256) public shareholderIndexes;
    mapping (address => uint256) public shareholderClaims;
    mapping (address => Share) public shares;
    
    uint256 public totalShares;
    uint256 public totalDividends;
    uint256 public totalDistributed;
    uint256 public dividendsPerShare;
    uint256 public constant dividendsPerShareAccuracyFactor = 10 ** 36;
    
    uint256 public minPeriod;
    uint256 public minDistribution;
    uint256 public minTokenBalanceForDividends;
    
    uint256 currentIndex;
    
    modifier onlyToken() {
        require(msg.sender == token, "Caller is not the token contract");
        _;
    }
    
    constructor(address _rewardToken, uint256 _minPeriod, uint256 _minDistribution, uint256 _minHoldForDividends) {
        token = msg.sender;
        rewardToken = IERC20(_rewardToken);
        minPeriod = _minPeriod;
        minDistribution = _minDistribution;
        minTokenBalanceForDividends = _minHoldForDividends;
    }
    
    function setDistributionCriteria(
        uint256 _minPeriod, 
        uint256 _minDistribution, 
        uint256 _minHoldForDividends
    ) external override onlyToken {
        minPeriod = _minPeriod;
        minDistribution = _minDistribution;
        minTokenBalanceForDividends = _minHoldForDividends;
    }
    
    function setShare(address shareholder, uint256 amount) external override onlyToken {
        if (shares[shareholder].amount > 0) {
            distributeDividend(shareholder);
        }
        
        if (amount >= minTokenBalanceForDividends && shares[shareholder].amount == 0) {
            addShareholder(shareholder);
        } else if (amount < minTokenBalanceForDividends && shares[shareholder].amount > 0) {
            removeShareholder(shareholder);
        }
        
        totalShares = totalShares.sub(shares[shareholder].amount).add(amount);
        shares[shareholder].amount = amount;
        shares[shareholder].totalExcluded = getCumulativeDividends(amount);
    }
    
    function deposit(uint256 amount) external override onlyToken {
        require(rewardToken.balanceOf(msg.sender) >= amount, "Insufficient reward tokens");
        
        totalDividends = totalDividends.add(amount);
        dividendsPerShare = dividendsPerShare.add(
            dividendsPerShareAccuracyFactor.mul(amount).div(totalShares)
        );
    }
    
    function process(uint256 gas) external override onlyToken {
        uint256 shareholderCount = shareholders.length;
        
        if (shareholderCount == 0) return;
        
        uint256 gasUsed = 0;
        uint256 gasLeft = gasleft();
        uint256 iterations = 0;
        
        while (gasUsed < gas && iterations < shareholderCount) {
            if (currentIndex >= shareholderCount) {
                currentIndex = 0;
            }
            
            if (shouldDistribute(shareholders[currentIndex])) {
                distributeDividend(shareholders[currentIndex]);
            }
            
            gasUsed = gasUsed.add(gasLeft.sub(gasleft()));
            gasLeft = gasleft();
            currentIndex++;
            iterations++;
        }
    }
    
    function shouldDistribute(address shareholder) internal view returns (bool) {
        return shareholderClaims[shareholder] + minPeriod < block.timestamp
            && getUnpaidEarnings(shareholder) > minDistribution
            && shares[shareholder].amount >= minTokenBalanceForDividends;
    }
    
    function distributeDividend(address shareholder) internal {
        if (shares[shareholder].amount == 0) return;
        
        uint256 amount = getUnpaidEarnings(shareholder);
        if (amount > 0 && rewardToken.balanceOf(address(this)) >= amount) {
            totalDistributed = totalDistributed.add(amount);
            rewardToken.transfer(shareholder, amount);
            shareholderClaims[shareholder] = block.timestamp;
            shares[shareholder].totalRealised = shares[shareholder].totalRealised.add(amount);
            shares[shareholder].totalExcluded = getCumulativeDividends(shares[shareholder].amount);
        }
    }
    
    function claimDividend() external override {
        require(shouldDistribute(msg.sender), "Too soon or insufficient earnings");
        distributeDividend(msg.sender);
    }
    
    function getUnpaidEarnings(address shareholder) public view override returns (uint256) {
        if (shares[shareholder].amount == 0) return 0;
        
        uint256 shareholderTotalDividends = getCumulativeDividends(shares[shareholder].amount);
        uint256 shareholderTotalExcluded = shares[shareholder].totalExcluded;
        
        if (shareholderTotalDividends <= shareholderTotalExcluded) return 0;
        
        return shareholderTotalDividends.sub(shareholderTotalExcluded);
    }
    
    function getCumulativeDividends(uint256 share) internal view returns (uint256) {
        return share.mul(dividendsPerShare).div(dividendsPerShareAccuracyFactor);
    }
    
    function addShareholder(address shareholder) internal {
        shareholderIndexes[shareholder] = shareholders.length;
        shareholders.push(shareholder);
    }
    
    function removeShareholder(address shareholder) internal {
        shareholders[shareholderIndexes[shareholder]] = shareholders[shareholders.length - 1];
        shareholderIndexes[shareholders[shareholders.length - 1]] = shareholderIndexes[shareholder];
        shareholders.pop();
    }
}

contract GLDR is IERC20, Ownable {
    using SafeMath for uint256;
    
    string private constant _name = "GoldRush";
    string private constant _symbol = "GLDR";
    uint8 private constant _decimals = 18;
    uint256 private constant _totalSupply = 100 * 10 ** 9 * 10 ** _decimals;
    
    // Fixed reward token address
    address public constant REWARD_TOKEN = 0x68749665FF8D2d112Fa859AA293F07A622782F38;
    
    // Fees and allocations
    struct FeeSettings {
        uint256 buy;
        uint256 sell;
        uint256 transfer;
        uint256 denominator;
    }
    
    struct Allocation {
        uint256 marketing;
        uint256 liquidity;
        uint256 burn;
        uint256 rewards;
        uint256 total;
    }
    
    FeeSettings public fees;
    Allocation public allocation;
    
    // Limits
    uint256 public maxTransactionAmount;
    uint256 public maxWalletBalance;
    
    // Addresses
    address public marketingWallet;
    address public baseToken;
    address public pair;
    
    // Mappings
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) public isFeeExempt;
    mapping (address => bool) public isTxLimitExempt;
    mapping (address => bool) public isWalletLimitExempt;
    mapping (address => bool) public isDividendExempt;
    mapping (address => bool) public isBlacklisted;
    
    // Contract instances
    IDEXRouter public router;
    DividendDistributor public distributor;
    
    // Swap settings
    bool public swapEnabled = true;
    uint256 public swapThreshold;
    uint256 public maxSwapAmount;
    bool private inSwap;
    
    // Trading state
    uint256 public launchedAt;
    
    // Events
    event AutoLiquidity(uint256 tokens, uint256 baseToken);
    event DistributionCriteriaUpdated(uint256 minPeriod, uint256 minDistribution, uint256 minHold);
    event FeesUpdated(uint256 buy, uint256 sell, uint256 transfer);
    event AllocationUpdated(uint256 marketing, uint256 liquidity, uint256 burn, uint256 rewards);
    
    modifier swapping() {
        inSwap = true;
        _;
        inSwap = false;
    }
    
    constructor(address _router) Ownable(msg.sender) {
        router = IDEXRouter(_router);
        baseToken = router.WETH(); // Use WETH as base token for trading
        
        // Create pair with WETH
        pair = IDEXFactory(router.factory()).createPair(baseToken, address(this));
        
        // Initialize distributor with fixed reward token
        distributor = new DividendDistributor(
            REWARD_TOKEN,  // Fixed reward token address
            5 minutes,      // minPeriod
            1 * 10 ** 18,   // minDistribution
            _totalSupply.div(10000) // minHoldForDividends
        );
        
        // Approve router
        _allowances[address(this)][address(router)] = type(uint256).max;
        IERC20(baseToken).approve(address(router), type(uint256).max);
        IERC20(REWARD_TOKEN).approve(address(router), type(uint256).max);
        
        // Initialize settings
        _initializeSettings();
        _initializeExemptions();
        
        // Mint total supply to deployer
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }
    
    function _initializeSettings() private {
        // UPDATED: 7% buy/sell, 0% transfer
        fees = FeeSettings({
            buy: 700,        // 7% (700/10000 = 7%)
            sell: 700,       // 7% (700/10000 = 7%)
            transfer: 0,     // 0%
            denominator: 10000
        });
        
        // Allocation (20% marketing, 20% liquidity, 0% burn, 60% rewards)
        allocation = Allocation({
            marketing: 20,   // 20% of fees = 1.4% total
            liquidity: 20,   // 20% of fees = 1.4% total
            burn: 0,         // 0% of fees = 0% total
            rewards: 60,     // 60% of fees = 4.2% total
            total: 100
        });
        
        // Limits (2% of supply)
        maxTransactionAmount = _totalSupply.mul(200).div(10000); // 2%
        maxWalletBalance = _totalSupply.mul(200).div(10000);     // 2%
        
        // Swap settings (0.1% threshold, 1% max swap)
        swapThreshold = _totalSupply.mul(10).div(10000);  // 0.1%
        maxSwapAmount = _totalSupply.mul(100).div(10000); // 1%
        
        marketingWallet = msg.sender;
    }
    
    function _initializeExemptions() private {
        isFeeExempt[msg.sender] = true;
        isFeeExempt[address(this)] = true;
        isFeeExempt[address(router)] = true;
        
        isTxLimitExempt[msg.sender] = true;
        isTxLimitExempt[address(this)] = true;
        isTxLimitExempt[address(router)] = true;
        
        isWalletLimitExempt[msg.sender] = true;
        isWalletLimitExempt[address(this)] = true;
        isWalletLimitExempt[pair] = true;
        isWalletLimitExempt[address(0xdead)] = true;
        
        isDividendExempt[address(this)] = true;
        isDividendExempt[pair] = true;
        isDividendExempt[address(0xdead)] = true;
        isDividendExempt[address(router)] = true;
    }
    
    // IERC20 functions
    function totalSupply() external pure returns (uint256) { return _totalSupply; }
    function decimals() external pure returns (uint8) { return _decimals; }
    function symbol() external pure returns (string memory) { return _symbol; }
    function name() external pure returns (string memory) { return _name; }
    
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }
    
    function allowance(address holder, address spender) external view returns (uint256) {
        return _allowances[holder][spender];
    }
    
    function approve(address spender, uint256 amount) public returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }
    
    function transfer(address recipient, uint256 amount) external returns (bool) {
        return _transferFrom(msg.sender, recipient, amount);
    }
    
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool) {
        if (_allowances[sender][msg.sender] != type(uint256).max) {
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, "Insufficient Allowance");
        }
        return _transferFrom(sender, recipient, amount);
    }
    
    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        require(!isBlacklisted[sender] && !isBlacklisted[recipient], "Address is blacklisted");
        require(amount > 0, "Transfer amount must be greater than zero");
        
        if (inSwap) {
            return _basicTransfer(sender, recipient, amount);
        }
        
        // Check if trading is enabled
        if (sender != owner() && recipient != owner()) {
            require(launchedAt > 0, "Trading not yet enabled");
        }
        
        // Check transaction limit
        if (!isTxLimitExempt[sender] && !isTxLimitExempt[recipient]) {
            require(amount <= maxTransactionAmount, "Transfer amount exceeds max transaction limit");
        }
        
        // Check wallet limit
        if (!isWalletLimitExempt[recipient]) {
            require(balanceOf(recipient).add(amount) <= maxWalletBalance, "Exceeds max wallet balance");
        }
        
        // Swap back if conditions are met
        if (shouldSwapBack() && recipient == pair) {
            swapBack();
        }
        
        // Calculate actual transfer amount
        uint256 amountReceived = shouldTakeFee(sender, recipient) ? 
            takeFee(sender, recipient, amount) : amount;
        
        // Execute transfer
        _balances[sender] = _balances[sender].sub(amount, "Insufficient balance");
        _balances[recipient] = _balances[recipient].add(amountReceived);
        
        // Update dividend tracking
        _updateDividendTracking(sender, recipient);
        
        emit Transfer(sender, recipient, amountReceived);
        return true;
    }
    
    function _basicTransfer(address sender, address recipient, uint256 amount) internal returns (bool) {
        _balances[sender] = _balances[sender].sub(amount, "Insufficient balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        return true;
    }
    
    function _updateDividendTracking(address sender, address recipient) internal {
        if (!isDividendExempt[sender]) {
            try distributor.setShare(sender, _balances[sender]) {} catch {}
        }
        if (!isDividendExempt[recipient]) {
            try distributor.setShare(recipient, _balances[recipient]) {} catch {}
        }
        
        try distributor.process(500000) {} catch {}
    }
    
    function shouldTakeFee(address sender, address recipient) internal view returns (bool) {
        return !isFeeExempt[sender] && !isFeeExempt[recipient];
    }
    
    function takeFee(address sender, address recipient, uint256 amount) internal returns (uint256) {
        uint256 feeAmount;
        
        if (recipient == pair) {
            feeAmount = amount.mul(fees.sell).div(fees.denominator);
        } else if (sender == pair) {
            feeAmount = amount.mul(fees.buy).div(fees.denominator);
        } else {
            feeAmount = amount.mul(fees.transfer).div(fees.denominator);
        }
        
        if (feeAmount > 0) {
            _balances[address(this)] = _balances[address(this)].add(feeAmount);
            emit Transfer(sender, address(this), feeAmount);
        }
        
        return amount.sub(feeAmount);
    }
    
    function shouldSwapBack() internal view returns (bool) {
        return msg.sender != pair
            && !inSwap
            && swapEnabled
            && _balances[address(this)] >= swapThreshold;
    }
    
    function swapBack() internal swapping {
        uint256 contractTokenBalance = _balances[address(this)];
        if (contractTokenBalance > maxSwapAmount) {
            contractTokenBalance = maxSwapAmount;
        }
        
        // Calculate allocations
        uint256 tokensForBurn = contractTokenBalance.mul(allocation.burn).div(allocation.total);
        uint256 tokensForLiquidity = contractTokenBalance.mul(allocation.liquidity).div(allocation.total).div(2);
        uint256 tokensToSwap = contractTokenBalance.sub(tokensForBurn).sub(tokensForLiquidity);
        
        // Burn tokens if allocated
        if (tokensForBurn > 0) {
            _basicTransfer(address(this), address(0xdead), tokensForBurn);
        }
        
        // Swap tokens for ETH first
        uint256 initialETHBalance = address(this).balance;
        
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = baseToken; // WETH
        
        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokensToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );
        
        uint256 ethReceived = address(this).balance.sub(initialETHBalance);
        
        // Calculate ETH allocations
        uint256 totalAllocation = allocation.total.sub(allocation.liquidity.div(2)).sub(allocation.burn);
        uint256 ethForRewards = ethReceived.mul(allocation.rewards).div(totalAllocation);
        uint256 ethForMarketing = ethReceived.mul(allocation.marketing).div(totalAllocation);
        uint256 ethForLiquidity = ethReceived.sub(ethForRewards).sub(ethForMarketing);
        
        // Buy reward tokens with ETH for rewards
        if (ethForRewards > 0) {
            _buyRewardTokens(ethForRewards);
        }
        
        // Send marketing share as ETH
        if (ethForMarketing > 0) {
            payable(marketingWallet).transfer(ethForMarketing);
        }
        
        // Add liquidity
        if (tokensForLiquidity > 0 && ethForLiquidity > 0) {
            router.addLiquidityETH{value: ethForLiquidity}(
                address(this),
                tokensForLiquidity,
                0,
                0,
                marketingWallet,
                block.timestamp
            );
            emit AutoLiquidity(tokensForLiquidity, ethForLiquidity);
        }
    }
    
    function _buyRewardTokens(uint256 ethAmount) internal {
        address[] memory path = new address[](2);
        path[0] = baseToken; // WETH
        path[1] = REWARD_TOKEN;
        
        // Convert ETH to WETH first, then swap to reward token
        router.swapExactETHForTokensSupportingFeeOnTransferTokens{value: ethAmount}(
            0,
            path,
            address(distributor),
            block.timestamp
        );
        
        // Get the amount of reward tokens received and deposit to distributor
        uint256 rewardTokenBalance = IERC20(REWARD_TOKEN).balanceOf(address(distributor));
        if (rewardTokenBalance > 0) {
            distributor.deposit(rewardTokenBalance);
        }
    }
    
    // Administrative functions
    function launch() external onlyOwner {
        require(launchedAt == 0, "Already launched");
        launchedAt = block.number;
    }
    
    function setFees(uint256 _buy, uint256 _sell, uint256 _transfer) external onlyOwner {
        require(_buy <= 1000 && _sell <= 1000 && _transfer <= 1000, "Fees too high"); // Max 10%
        fees.buy = _buy;
        fees.sell = _sell;
        fees.transfer = _transfer;
        emit FeesUpdated(_buy, _sell, _transfer);
    }
    
    function setAllocation(uint256 _marketing, uint256 _liquidity, uint256 _burn, uint256 _rewards) external onlyOwner {
        uint256 total = _marketing.add(_liquidity).add(_burn).add(_rewards);
        require(total == 100, "Allocations must sum to 100%");
        
        allocation.marketing = _marketing;
        allocation.liquidity = _liquidity;
        allocation.burn = _burn;
        allocation.rewards = _rewards;
        allocation.total = total;
        
        emit AllocationUpdated(_marketing, _liquidity, _burn, _rewards);
    }
    
    function setLimits(uint256 _maxTx, uint256 _maxWallet) external onlyOwner {
        require(_maxTx >= _totalSupply.div(1000), "Max transaction too low"); // Min 0.1%
        require(_maxWallet >= _totalSupply.div(1000), "Max wallet too low"); // Min 0.1%
        
        maxTransactionAmount = _maxTx;
        maxWalletBalance = _maxWallet;
    }
    
    function setSwapSettings(bool _enabled, uint256 _threshold, uint256 _maxSwap) external onlyOwner {
        swapEnabled = _enabled;
        swapThreshold = _threshold;
        maxSwapAmount = _maxSwap;
    }
    
    function setDistributionCriteria(uint256 _minPeriod, uint256 _minDistribution, uint256 _minHold) external onlyOwner {
        distributor.setDistributionCriteria(_minPeriod, _minDistribution, _minHold);
        emit DistributionCriteriaUpdated(_minPeriod, _minDistribution, _minHold);
    }
    
    function setFeeExempt(address _address, bool _exempt) external onlyOwner {
        isFeeExempt[_address] = _exempt;
    }
    
    function setTxLimitExempt(address _address, bool _exempt) external onlyOwner {
        isTxLimitExempt[_address] = _exempt;
    }
    
    function setWalletLimitExempt(address _address, bool _exempt) external onlyOwner {
        isWalletLimitExempt[_address] = _exempt;
    }
    
    function setDividendExempt(address _address, bool _exempt) external onlyOwner {
        require(_address != address(this) && _address != pair, "Cannot exempt this address");
        isDividendExempt[_address] = _exempt;
        
        if (_exempt) {
            distributor.setShare(_address, 0);
        } else {
            distributor.setShare(_address, _balances[_address]);
        }
    }
    
    function setBlacklist(address _address, bool _blacklisted) external onlyOwner {
        isBlacklisted[_address] = _blacklisted;
    }
    
    function setMarketingWallet(address _marketingWallet) external onlyOwner {
        require(_marketingWallet != address(0), "Marketing wallet cannot be zero address");
        marketingWallet = _marketingWallet;
    }
    
    // Emergency functions
    function rescueTokens(address _token, uint256 _amount) external onlyOwner {
        require(_token != address(this), "Cannot rescue native token");
        IERC20(_token).transfer(owner(), _amount);
    }
    
    function rescueETH(uint256 _amount) external onlyOwner {
        payable(owner()).transfer(_amount);
    }
    
    // View functions
    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(address(0xdead)));
    }
    
    function getClaimableDividends(address shareholder) external view returns (uint256) {
        return distributor.getUnpaidEarnings(shareholder);
    }
    
    function claimDividends() external {
        distributor.claimDividend();
    }
    
    function getRewardToken() external pure returns (address) {
        return REWARD_TOKEN;
    }
    
    // Helper function to get current tax rates
    function getTaxRates() external view returns (uint256 buyTax, uint256 sellTax, uint256 transferTax) {
        buyTax = fees.buy.mul(100).div(fees.denominator);
        sellTax = fees.sell.mul(100).div(fees.denominator);
        transferTax = fees.transfer.mul(100).div(fees.denominator);
    }
    
    receive() external payable {}
}"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
"
    },
    "@openzeppelin/contracts/utils/math/SafeMath.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": false,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    },
    "remappings": []
  }
}}