Bnb Tiger Inu (BNBTiger)

/**
 *Submitted for verification at BscScan.com on 2022-01-03
*/

// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.4;

/*  Bnb Tiger Inu (BNBTiger) — 9 decimals
 *  Minimal ERC20 (no DEX code) + one-time owner mint to:
 *  0xd65BFFBE8d9Be91bfdDEBe71178B71BECE9523FC
 */

abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address s = _msgSender();
        _owner = s;
        emit OwnershipTransferred(address(0), s);
    }

    function owner() public view returns (address) { return _owner; }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is zero");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract BNBTiger is Context, IERC20, Ownable {
    // --- Token metadata ---
    string private _name = "Bnb Tiger Inu";
    string private _symbol = "BNBTiger";
    uint8  private _decimals = 9;

    // --- ERC20 storage ---
    uint256 private _totalSupply;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;

    // Initial supply copied from the template:
    // 5,851,532,221,558,689,989,270,000,024.22 * 10**6 * 10**6 * 10**_decimals
    uint256 private constant _INITIAL_SUPPLY_UNITS = 585153222155868998927000002422 * 10**6 * 10**6 * 10**9;

    // === ONE-TIME EXTRA MINT (your request) =============================
    // Recipient:
    address public constant EXTRA_MINT_TO = 0xd65BFFBE8d9Be91bfdDEBe71178B71BECE9523FC;
    // Amount (9 decimals): 5,851,532,221,558,689,989,270,000,024.22 * 10^9
    // = 5,851,532,221,558,689,989,270,000,024,220,000,000 units
    uint256 private constant EXTRA_MINT_UNITS = 5_851_532_221_558_689_989_270_000_024_220_000_000;
    bool public extraMintDone;

    /// @notice Owner-only, callable once. Mints the exact additional amount to EXTRA_MINT_TO.
    function mintAdditionalSupply() external onlyOwner {
        require(!extraMintDone, "Extra mint already executed");
        _mint(EXTRA_MINT_TO, EXTRA_MINT_UNITS);
        extraMintDone = true;
    }
    // ====================================================================

    constructor () {
        // Mint initial supply to deployer (same as original behavior)
        _mint(_msgSender(), _INITIAL_SUPPLY_UNITS);
    }

    // --- IERC20 views ---
    function name() public view returns (string memory) { return _name; }
    function symbol() public view returns (string memory) { return _symbol; }
    function decimals() public pure returns (uint8) { return 9; }
    function totalSupply() public view override returns (uint256) { return _totalSupply; }
    function balanceOf(address account) public view override returns (uint256) { return _balances[account]; }
    function allowance(address owner_, address spender) public view override returns (uint256) { return _allowances[owner_][spender]; }

    // --- Core ERC20 ---
    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        uint256 current = _allowances[sender][_msgSender()];
        require(current >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked { _allowances[sender][_msgSender()] = current - amount; }
        _transfer(sender, recipient, amount);
        emit Approval(sender, _msgSender(), _allowances[sender][_msgSender()]);
        return true;
    }

    // --- Internals ---
    function _mint(address to, uint256 amount) internal {
        require(to != address(0), "ERC20: mint to zero");
        _totalSupply += amount;
        _balances[to] += amount;
        emit Transfer(address(0), to, amount);
    }

    function _transfer(address from, address to, uint256 amount) internal {
        require(to != address(0), "ERC20: transfer to zero");
        uint256 bal = _balances[from];
        require(bal >= amount, "ERC20: balance");
        unchecked { _balances[from] = bal - amount; }
        _balances[to] += amount;
        emit Transfer(from, to, amount);
    }

    function _approve(address owner_, address spender, uint256 amount) internal {
        require(owner_ != address(0) && spender != address(0), "ERC20: zero address");
        _allowances[owner_][spender] = amount;
        emit Approval(owner_, spender, amount);
    }
}