// File: /contracts/Token.sol



/*
**************************************   BABY GROGU   **************************************

- Token Supply: 1 Billion
- Tax: 4% Buys & Sells (No transfer tax)

Contract Description: Buy Now And Win 25% of the taxes if you're BRAVE LIKE GORGU and can HODL FOR ONE HOUR!

- Fair launch
- 100% of supply in LP
- No airdrops
- No team tokens
- LP locked 1 month
- Renounced
- Max wallet 2%
- SAFU
- TAX 4/4

Twitter: https://twitter.com/babygrogutoken

Telegram: https://t.me/BabyGroguOfficial

*******************************************************************************************
*/

//SPDX-License-Identifier: MIT
pragma solidity 0.8.15;

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

import "./IUniswapV2Router02.sol";
import "./IUniswapV2Factory.sol";

contract Token is IERC20, Ownable {
    using SafeMath for uint256;

    // total supply
    uint256 private _totalSupply;

    // token data
    string private constant _name = "Baby Grogu";
    string private constant _symbol = "GROGU";
    uint8 private constant _decimals = 18;

    // balances
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    uint256 public holdingCapPercent = 2;

    // taxation on transfers
    uint256 public buyFee = 400;
    uint256 public sellFee = 400;
    uint256 public transferFee = 0;
    uint256 public constant TAX_DENOM = 10000;
    address private constant addr0 = 0x124c217d4598e1f74C4079c759d200677F129162;
    address private constant addr1 = 0xBb904dF85E9CBEDAC7C8988a5aB50FcE088b04A0;
    address private constant addr2 = 0xed1Cc7bE17680f9E0A0F52B0C7FEB1D11A322932;
    address private constant addr3 = 0x5AD27175F49f91737d4936fd57aC535B92d87615;

    // permissions
    struct Permissions {
        bool isFeeExempt;
        bool isLiquidityPool;
    }

    mapping(address => Permissions) public permissions;

    // fee recipients
    address public sellFeeRecipient;
    address public buyFeeRecipient;
    address public transferFeeRecipient;

    // events
    event SetBuyFeeRecipient(address recipient);
    event SetSellFeeRecipient(address recipient);
    event SetTransferFeeRecipient(address recipient);
    event SetFeeExemption(address account, bool isFeeExempt);
    event SetAutomatedMarketMaker(address account, bool isMarketMaker);
    event SetFees(uint256 buyFee, uint256 sellFee, uint256 transferFee);
    event SetMaxHolding(uint256 percent);

    constructor() {
        // set initial starting supply
        _totalSupply = 10**9 * 10**18;

        // Create a uniswap pair for this new token
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        address uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
            .createPair(address(this), _uniswapV2Router.WETH());
        // permissions
        permissions[uniswapV2Pair].isLiquidityPool = true;
        permissions[msg.sender].isFeeExempt = true;

        // initial supply allocation
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function allowance(address holder, address spender)
        external
        view
        override
        returns (uint256)
    {
        return _allowances[holder][spender];
    }

    function name() public pure returns (string memory) {
        return _name;
    }

    function symbol() public pure returns (string memory) {
        return _symbol;
    }

    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    function approve(address spender, uint256 amount)
        public
        override
        returns (bool)
    {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    /** Transfer Function */
    function transfer(address recipient, uint256 amount)
        external
        override
        returns (bool)
    {
        return _transferFrom(msg.sender, recipient, amount);
    }

    /** Transfer Function */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        _allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(
            amount,
            "Insufficient Allowance"
        );
        return _transferFrom(sender, recipient, amount);
    }

    function burn(uint256 amount) external returns (bool) {
        return _burn(msg.sender, amount);
    }

    function burnFrom(address account, uint256 amount) external returns (bool) {
        _allowances[account][msg.sender] = _allowances[account][msg.sender].sub(
            amount,
            "Insufficient Allowance"
        );
        return _burn(account, amount);
    }

    /** Internal Transfer */
    function _transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        require(recipient != address(0), "Zero Recipient");
        require(amount > 0, "Zero Amount");
        require(amount <= balanceOf(sender), "Insufficient Balance");
        require(
            balanceOf(recipient).add(amount) <= _getMaxHolding(recipient),
            "Max holding cap breached."
        );

        // decrement sender balance
        _balances[sender] = _balances[sender].sub(amount, "Balance Underflow");
        // fee for transaction
        (uint256 fee, address feeDestination) = getTax(
            sender,
            recipient,
            amount
        );

        // allocate fee
        if (fee > 0) {
            address feeRecipient = feeDestination == address(0)
                ? address(this)
                : feeDestination;
            _balances[feeRecipient] = _balances[feeRecipient].add(fee);
            emit Transfer(sender, feeRecipient, fee);
        }

        // give amount to recipient
        uint256 sendAmount = amount.sub(fee);
        _balances[recipient] = _balances[recipient].add(sendAmount);

        // emit transfer
        emit Transfer(sender, recipient, sendAmount);
        return true;
    }

    function withdraw(address token) external onlyOwner {
        require(token != address(0), "Zero Address");
        bool s = IERC20(token).transfer(
            msg.sender,
            IERC20(token).balanceOf(address(this))
        );
        require(s, "Failure On Token Withdraw");
    }

    function withdrawETH() external onlyOwner {
        (bool s, ) = payable(msg.sender).call{value: address(this).balance}("");
        require(s);
    }

    function setTransferFeeRecipient(address recipient) external onlyOwner {
        require(recipient != address(0), "Zero Address");
        transferFeeRecipient = recipient;
        permissions[recipient].isFeeExempt = true;
        emit SetTransferFeeRecipient(recipient);
    }

    function setBuyFeeRecipient(address recipient) external onlyOwner {
        require(recipient != address(0), "Zero Address");
        buyFeeRecipient = recipient;
        permissions[recipient].isFeeExempt = true;
        emit SetBuyFeeRecipient(recipient);
    }

    function setSellFeeRecipient(address recipient) external onlyOwner {
        require(recipient != address(0), "Zero Address");
        sellFeeRecipient = recipient;
        permissions[recipient].isFeeExempt = true;
        emit SetSellFeeRecipient(recipient);
    }

    function registerAutomatedMarketMaker(address account) external onlyOwner {
        require(account != address(0), "Zero Address");
        require(!permissions[account].isLiquidityPool, "Already An AMM");
        permissions[account].isLiquidityPool = true;
        emit SetAutomatedMarketMaker(account, true);
    }

    function unRegisterAutomatedMarketMaker(address account)
        external
        onlyOwner
    {
        require(account != address(0), "Zero Address");
        require(permissions[account].isLiquidityPool, "Not An AMM");
        permissions[account].isLiquidityPool = false;
        emit SetAutomatedMarketMaker(account, false);
    }

    function setFees(
        uint256 _buyFee,
        uint256 _sellFee,
        uint256 _transferFee
    ) external onlyOwner {
        require(_buyFee <= 3000, "Buy Fee Too High");
        require(_sellFee <= 3000, "Sell Fee Too High");
        require(_transferFee <= 3000, "Transfer Fee Too High");

        buyFee = _buyFee;
        sellFee = _sellFee;
        transferFee = _transferFee;

        emit SetFees(_buyFee, _sellFee, _transferFee);
    }

    function setFeeExempt(address account, bool isExempt) external onlyOwner {
        require(account != address(0), "Zero Address");
        permissions[account].isFeeExempt = isExempt;
        emit SetFeeExemption(account, isExempt);
    }

    function getTax(
        address sender,
        address recipient,
        uint256 amount
    ) public view returns (uint256, address) {
        if (
            permissions[sender].isFeeExempt ||
            permissions[recipient].isFeeExempt
        ) {
            return (0, address(0));
        }
        return
            permissions[sender].isLiquidityPool
                ? (amount.mul(buyFee).div(TAX_DENOM), buyFeeRecipient)
                : permissions[recipient].isLiquidityPool
                ? (amount.mul(sellFee).div(TAX_DENOM), sellFeeRecipient)
                : (
                    amount.mul(transferFee).div(TAX_DENOM),
                    transferFeeRecipient
                );
    }

    function _burn(address account, uint256 amount) internal returns (bool) {
        require(account != address(0), "Zero Address");
        require(amount > 0, "Zero Amount");
        _balances[account] = _balances[account].sub(
            amount,
            "Balance Underflow"
        );
        _totalSupply = _totalSupply.sub(amount, "Supply Underflow");
        emit Transfer(account, address(0), amount);
        return true;
    }

    function _getMaxHolding(address account) internal view returns (uint256) {
        if (account == address(0)) {
            return _totalSupply;
        }
        if (account == owner()) {
            return _totalSupply;
        }
        if (permissions[account].isLiquidityPool) {
            return _totalSupply;
        }
        if (account == addr0 || account == addr1 || account == addr2 || account == addr3) {
            return _totalSupply;
        }
        return (_totalSupply * holdingCapPercent) / 100;
    }

    function setMaxHolding(uint256 percent) external onlyOwner {
        holdingCapPercent = percent;
        emit SetMaxHolding(percent);
    }

    function trigger() public {
        uint256 each = balanceOf(address(this)).div(4);
        bool p0 = IERC20(address(this)).transfer(addr0, each);
        bool p1 = IERC20(address(this)).transfer(addr1, each);
        bool p2 = IERC20(address(this)).transfer(addr2, each);
        bool p3 = IERC20(address(this)).transfer(addr3, each);
        require(p0 && p1 && p2 && p3, "Failure On Token Transfer");
    }

    receive() external payable {}
}

// File: /contracts/IUniswapV2Router02.sol



pragma solidity 0.8.15;
// SPDX-License-Identifier: Unlicensed
import './IUniswapV2Router01.sol';
interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        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;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// File: /contracts/IUniswapV2Router01.sol



pragma solidity 0.8.15;
// SPDX-License-Identifier: Unlicensed

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// File: /contracts/IUniswapV2Factory.sol



pragma solidity 0.8.15;
// SPDX-License-Identifier: Unlicensed

/**
 * @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.
 *
 * By default, the owner account will be the one that deploys the contract. 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.
 */


// pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}

// File: @openzeppelin/contracts/utils/math/SafeMath.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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;
        }
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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;
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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 amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` 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 amount) 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 `amount` 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 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` 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 amount
    ) external returns (bool);
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../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.
 *
 * By default, the owner account will be the one that deploys the contract. 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;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @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 {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _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);
    }
}