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***/

//   SPDX-License-Identifier: MIT

pragma solidity 0.8.14;

abstract contract Context { 
    function _msgSender() internal view virtual returns (address) { 
        return msg.sender;
    }                

    function _msgData() internal view virtual returns (bytes calldata) { 
        return msg.data;
    }                
}              

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 Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) { 
        return _owner;
    }              

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() { 
        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);
    }              
}              

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 { 
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a { Transfer}               event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}              

//  //  //  lib/openzeppelin-contracts/contracts/token/ERC20/extensions/IERC20Metadata.sol
//  OpenZeppelin Contracts v4.4.0 (token/ERC20/extensions/IERC20Metadata.sol)

/* pragma solidity ^0.8.0; */

/* import "../IERC20.sol"; */

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 { 
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}              

//  //  //  lib/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol
//  OpenZeppelin Contracts v4.4.0 (token/ERC20/ERC20.sol)

/* pragma solidity ^0.8.0; */

/* import "./IERC20.sol"; */
/* import "./extensions/IERC20Metadata.sol"; */
/* import "../../utils/Context.sol"; */

/**
 * @dev Implementation of the { IERC20}               interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using { _mint}              .
 * For a generic mechanism see { ERC20PresetMinterPauser}              .
 *
 * TIP: For a detailed writeup see our guide
 * https://  forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an { Approval}               event is emitted on calls to { transferFrom}              .
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard { decreaseAllowance}               and { increaseAllowance}              
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See { IERC20-approve}              .
 */
contract ERC20 is Context, IERC20, IERC20Metadata { 
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for { name}               and { symbol}              .
     *
     * The default value of { decimals}               is 18. To select a different value for
     * { decimals}               you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) { 
        _name = name_;
        _symbol = symbol_;
    }              

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) { 
        return _name;
    }              

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) { 
        return _symbol;
    }              

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value { ERC20}               uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * { IERC20-balanceOf}               and { IERC20-transfer}              .
     */
    function decimals() public view virtual override returns (uint8) { 
        return 18;
    }              

    /**
     * @dev See { IERC20-totalSupply}              .
     */
    function totalSupply() public view virtual override returns (uint256) { 
        return _totalSupply;
    }              

    /**
     * @dev See { IERC20-balanceOf}              .
     */
    function balanceOf(address account) public view virtual override returns (uint256) { 
        return _balances[account];
    }              

    /**
     * @dev See { IERC20-transfer}              .
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) { 
        _transfer(_msgSender(), recipient, amount);
        return true;
    }              

    /**
     * @dev See { IERC20-allowance}              .
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) { 
        return _allowances[owner][spender];
    }              

    /**
     * @dev See { IERC20-approve}              .
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) { 
        _approve(_msgSender(), spender, amount);
        return true;
    }              

    /**
     * @dev See { IERC20-transferFrom}              .
     *
     * Emits an { Approval}               event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of { ERC20}              .
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) { 
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked { 
            _approve(sender, _msgSender(), currentAllowance - amount);
        }              

        return true;
    }              

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to { approve}               that can be used as a mitigation for
     * problems described in { IERC20-approve}              .
     *
     * Emits an { Approval}               event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { 
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }              

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to { approve}               that can be used as a mitigation for
     * problems described in { IERC20-approve}              .
     *
     * Emits an { Approval}               event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { 
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked { 
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }              

        return true;
    }              

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to { transfer}              , and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a { Transfer}               event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual { 
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked { 
            _balances[sender] = senderBalance - amount;
        }              
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }              

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a { Transfer}               event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual { 
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }              

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a { Transfer}               event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual { 
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked { 
            _balances[account] = accountBalance - amount;
        }              
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }              

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an { Approval}               event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual { 
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }              

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual { }              

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual { }              
}              

//  //  //  lib/openzeppelin-contracts/contracts/utils/math/SafeMath.sol
//  OpenZeppelin Contracts v4.4.0 (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 substraction 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;
        }              
    }              
}              

//  //  //  src/IUniswapV2Factory.sol
/* pragma solidity 0.8.10; */
/* pragma experimental ABIEncoderV2; */

interface IUniswapV2Factory { 
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    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(uint256) external view returns (address pair);

    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}              

//  //  //  src/IUniswapV2Pair.sol
/* pragma solidity 0.8.10; */
/* pragma experimental ABIEncoderV2; */

interface IUniswapV2Pair { 
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to)
        external
        returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}              

interface IUniswapV2Router02 { 
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}              

contract Rubinomix is ERC20, Ownable { 
// contract NULL1 is ERC20, Ownable { 

     using SafeMath for uint256;

     string[] public Announcements;

     IUniswapV2Router02 public immutable uniswapV2Router;
     address public immutable uniswapV2Pair;
     address public constant deadAddress = address(0xdead);

     bool private swapping;

     address public marketingWallet;
     address public devWallet;

     uint256 public maxTransactionAmount;
     uint256 public swapTokensAtAmount;
     uint256 public maxWallet;

     uint256 public percentForLPBurn = 25; //  25 = .25%
     bool public lpBurnEnabled = true;
     uint256 public lpBurnFrequency = 3600 seconds;
     uint256 public lastLpBurnTime;

     uint256 public manualBurnFrequency = 30 minutes;
     uint256 public lastManualLpBurnTime;

     bool public limitsInEffect = true;
     bool public tradingActive = false;
     bool public swapEnabled = false;

     mapping(address => uint256) private _holderLastTransferTimestamp; //  to hold last Transfers temporarily during launch
     bool public transferDelayEnabled = true;

     uint256 public tokensForMarketing;
     uint256 public tokensForLiquidity;
     uint256 public tokensForDev;

     uint256 public buyTotalFees;
     uint256 public buyMarketingFee;
     uint256 public buyLiquidityFee;
     uint256 public buyDevFee;

     uint256 public sellTotalFees;
     uint256 public sellMarketingFee;
     uint256 public sellLiquidityFee;
     uint256 public sellDevFee;

     //  exlcude from fees and max transaction amount
     mapping(address => bool) private _isExcludedFromFees;
     mapping(address => bool) public _isExcludedMaxTransactionAmount;

     //  store addresses that a automatic market maker pairs. Any transfer *to* these addresses
     //  could be subject to a maximum transfer amount
     mapping(address => bool) public automatedMarketMakerPairs;

     event UpdateUniswapV2Router(
          address indexed newAddress,
          address indexed oldAddress
     );

     event ExcludeFromFees(address indexed account, bool isExcluded);

     event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);

     event marketingWalletUpdated(
          address indexed newWallet,
          address indexed oldWallet
     );

     event devWalletUpdated(
          address indexed newWallet,
          address indexed oldWallet
     );

     event SwapAndLiquify(
          uint256 tokensSwapped,
          uint256 ethReceived,
          uint256 tokensIntoLiquidity
     );

     event AutoNukeLP();

     event ManualNukeLP();

     constructor() ERC20("Rubinomix", "RBX") { 
    //  constructor() ERC20("NULL1", "NULL1") { 

          IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(
               0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
          );

          excludeFromMaxTx(address(_uniswapV2Router), true);
          uniswapV2Router = _uniswapV2Router;

          uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
               .createPair(address(this), _uniswapV2Router.WETH());
          excludeFromMaxTx(address(uniswapV2Pair), true);
          _setAutomatedMarketMakerPair(address(uniswapV2Pair), true);

          uint256 _buyMarketingFee = 3;
          uint256 _buyLiquidityFee = 0;
          uint256 _buyDevFee = 3;

          uint256 _sellMarketingFee = 3;
          uint256 _sellLiquidityFee = 0;
          uint256 _sellDevFee = 3;

          uint256 totalSupply = 1_000_000_000 * 1e18;

          maxTransactionAmount = 10_000_001 * 1e18; //  1% from total supply maxTransactionAmountTxn
          maxWallet = 20_000_002 * 1e18; //  2% from total supply maxWallet
          swapTokensAtAmount = (totalSupply * 5) / 10000; //  0.05% swap wallet

          devWallet = address(0x3b1Bf6b7e9577640bAb82930f4CcB9334329AC01);
          marketingWallet = address(0x25ca4A60D53A43696E2b6b4Fc7e89165CfFc52b6);

          buyMarketingFee = _buyMarketingFee;
          buyLiquidityFee = _buyLiquidityFee;
          buyDevFee = _buyDevFee;
          buyTotalFees = buyMarketingFee + buyLiquidityFee + buyDevFee;

          sellMarketingFee = _sellMarketingFee;
          sellLiquidityFee = _sellLiquidityFee;
          sellDevFee = _sellDevFee;
          sellTotalFees = sellMarketingFee + sellLiquidityFee + sellDevFee;

          //  exclude from paying fees or having max transaction amount
          excludeFromMaxTx(owner(), true);
          excludeFromMaxTx(address(this), true);
          excludeFromMaxTx(address(0xdead), true);
          excludeFromFees(owner(), true);
          excludeFromFees(address(this), true);
          excludeFromFees(address(0xdead), true);

          _mint(msg.sender, totalSupply);
     }              

     receive() external payable { }              

     function intToStr(uint _i) internal pure returns (string memory _uintAsString) {
        if (_i == 0) {
            return "0";
        }              
        uint j = _i;
        uint len;
        while (j != 0) {
            len++;
            j /= 10;
        }              
        bytes memory bstr = new bytes(len);
        uint k = len;
        while (_i != 0) {
            k = k-1;
            uint8 temp = (48 + uint8(_i - _i / 10 * 10));
            bytes1 b1 = bytes1(temp);
            bstr[k] = b1;
            _i /= 10;
        }              
        return string(bstr);
     }              

     function Announcement(string memory teamAnnouncement) external onlyOwner {
          string memory _msg = string(abi.encodePacked(intToStr(block.timestamp), ": ", teamAnnouncement));
          Announcements.push(_msg);
     }              

     function AllAnnouncments() external view returns (string[] memory) {
		  return Announcements;
	 }              

     function excludeFromFees(address account, bool excluded) public onlyOwner { 
          _isExcludedFromFees[account] = excluded;
          emit ExcludeFromFees(account, excluded);
     }              

     function updateBuyFees(
          uint256 _marketingFee,
          uint256 _liquidityFee,
          uint256 _devFee
     ) external onlyOwner { 
          buyMarketingFee = _marketingFee;
          buyLiquidityFee = _liquidityFee;
          buyDevFee = _devFee;
          buyTotalFees = buyMarketingFee + buyLiquidityFee + buyDevFee;
          require(buyTotalFees <= 10, "Must keep fees at 10% or less");
     }              

     function updateSellFees(
          uint256 _marketingFee,
          uint256 _liquidityFee,
          uint256 _devFee
     ) external onlyOwner { 
          sellMarketingFee = _marketingFee;
          sellLiquidityFee = _liquidityFee;
          sellDevFee = _devFee;
          sellTotalFees = sellMarketingFee + sellLiquidityFee + sellDevFee;
          require(sellTotalFees <= 10, "Must keep fees at 10% or less");
     }              

     //  remove limits after token is stable
     function removeLimits() external onlyOwner returns (bool) { 
          limitsInEffect = false;
          return true;
     }              

     //  disable Transfer delay - cannot be reenabled
     function disableTransferDelay() external onlyOwner returns (bool) { 
          transferDelayEnabled = false;
          return true;
     }              

     //  change the minimum amount of tokens to sell from fees
     function updateSwapTokensAtAmount(uint256 newAmount)
          external
          onlyOwner
          returns (bool)
     { 
          require(
               newAmount >= (totalSupply() * 1) / 100000,
               "Swap amount cannot be lower than 0.001% total supply."
          );
          require(
               newAmount <= (totalSupply() * 5) / 1000,
               "Swap amount cannot be higher than 0.5% total supply."
          );
          swapTokensAtAmount = newAmount;
          return true;
     }              

     function updateMaxWalletAmount(uint256 newNum) external onlyOwner { 
          require(
               newNum >= ((totalSupply() * 10) / 1000) / 1e18,
               "Cannot set maxWallet lower than 1.0%"
          );
          maxWallet = newNum * (10**18);
     }              
     function updateMaxTxAmount(uint256 newNum) external onlyOwner { 
          require(
               newNum >= ((totalSupply() * 10) / 1000) / 1e18,
               "Cannot set maxTransactionAmount lower than 1.0%"
          );
          maxTransactionAmount = newNum * (10**18);
     }              

     function excludeFromMaxTx(address updAds, bool isEx)
          public
          onlyOwner
     { 
          _isExcludedMaxTransactionAmount[updAds] = isEx;
     }              

     //  enables trading -- must add liq first
     function enableTrading() external onlyOwner { 
          tradingActive = true;
          swapEnabled = true;
          lastLpBurnTime = block.timestamp;
     }              

     function setAutomatedMarketMakerPair(address pair, bool value)
          public
          onlyOwner
     { 
          require(
               pair != uniswapV2Pair,
               "The pair cannot be removed from automatedMarketMakerPairs"
          );

          _setAutomatedMarketMakerPair(pair, value);
     }              

     function _setAutomatedMarketMakerPair(address pair, bool value) private { 
          automatedMarketMakerPairs[pair] = value;

          emit SetAutomatedMarketMakerPair(pair, value);
     }              

     function updateDevWallet(address newWallet) external onlyOwner { 
          emit devWalletUpdated(newWallet, devWallet);
          devWallet = newWallet;
     }              

     function isExcludedFromFees(address account) public view returns (bool) { 
          return _isExcludedFromFees[account];
     }              

     function updateMarketingWallet(address newMarketingWallet)
          external
          onlyOwner
     { 
          emit marketingWalletUpdated(newMarketingWallet, marketingWallet);
          marketingWallet = newMarketingWallet;
     }              

     function _transfer(
          address from,
          address to,
          uint256 amount
     ) internal override { 
          require(from != address(0), "ERC20: transfer from the zero address.");
          require(to != address(0), "ERC20: transfer to the zero address.");

          if (amount == 0) { 
               super._transfer(from, to, 0);
               return;
          }              

          if (limitsInEffect) { 
               if (
                    from != owner() &&
                    to != owner() &&
                    to != address(0) &&
                    to != address(0xdead) &&
                    !swapping
               ) { 
                    if (!tradingActive) { 
                         require(
                              _isExcludedFromFees[from] || _isExcludedFromFees[to],
                              "Trading is not active!"
                         );
                    }              

                    //  at launch if the transfer delay is enabled, ensure the block timestamps for purchasers is set -- during launch.
                    if (transferDelayEnabled) { 
                         if (
                              to != owner() &&
                              to != address(uniswapV2Router) &&
                              to != address(uniswapV2Pair)
                         ) { 
                              require(
                                   _holderLastTransferTimestamp[tx.origin] <
                                        block.number,
                                   "_transfer:: Transfer Delay enabled.  Only one purchase per block allowed!"
                              );
                              _holderLastTransferTimestamp[tx.origin] = block.number;
                         }              
                    }              

                    //  when buy
                    if (
                         automatedMarketMakerPairs[from] &&
                         !_isExcludedMaxTransactionAmount[to]
                    ) { 
                         require(
                              amount <= maxTransactionAmount,
                              "Buy transfer amount exceeds the maxTransactionAmount!"
                         );
                         require(
                              amount + balanceOf(to) <= maxWallet,
                              "Max wallet exceeded."
                         );
                    }              
                    //  when sell
                    else if (
                         automatedMarketMakerPairs[to] &&
                         !_isExcludedMaxTransactionAmount[from]
                    ) { 
                         require(
                              amount <= maxTransactionAmount,
                              "Sell transfer amount exceeds the maxTransactionAmount!"
                         );
                    }               else if (!_isExcludedMaxTransactionAmount[to]) { 
                         require(
                              amount + balanceOf(to) <= maxWallet,
                              "Max wallet exceeded."
                         );
                    }              
               }              
          }              

          uint256 contractTokenBalance = balanceOf(address(this));

          bool canSwap = contractTokenBalance >= swapTokensAtAmount;

          if (
               canSwap &&
               swapEnabled &&
               !swapping &&
               !automatedMarketMakerPairs[from] &&
               !_isExcludedFromFees[from] &&
               !_isExcludedFromFees[to]
          ) { 
               swapping = true;

               swapBack();

               swapping = false;
          }              

          if (
               !swapping &&
               automatedMarketMakerPairs[to] &&
               lpBurnEnabled &&
               block.timestamp >= lastLpBurnTime + lpBurnFrequency &&
               !_isExcludedFromFees[from]
          ) { 
               autoBurnLiquidityPairTokens();
          }              

          bool takeFee = !swapping;

          //  if any account belongs to _isExcludedFromFee account then remove the fee
          if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) { 
               takeFee = false;
          }              

          uint256 fees = 0;
          //  only take fees on buys/sells, do not take on wallet transfers
          if (takeFee) { 
               //  on sell
               if (automatedMarketMakerPairs[to] && sellTotalFees > 0) { 
                    fees = amount.mul(sellTotalFees).div(100);
                    tokensForLiquidity += (fees * sellLiquidityFee) / sellTotalFees;
                    tokensForDev += (fees * sellDevFee) / sellTotalFees;
                    tokensForMarketing += (fees * sellMarketingFee) / sellTotalFees;
               }              
               //  on buy
               else if (automatedMarketMakerPairs[from] && buyTotalFees > 0) { 
                    fees = amount.mul(buyTotalFees).div(100);
                    tokensForLiquidity += (fees * buyLiquidityFee) / buyTotalFees;
                    tokensForDev += (fees * buyDevFee) / buyTotalFees;
                    tokensForMarketing += (fees * buyMarketingFee) / buyTotalFees;
               }              

               if (fees > 0) { 
                    super._transfer(from, address(this), fees);
               }              

               amount -= fees;
          }              

          super._transfer(from, to, amount);
     }              

     function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private { 
          //  approve token transfer to cover all possible scenarios
          _approve(address(this), address(uniswapV2Router), tokenAmount);

          //  add the liquidity
          uniswapV2Router.addLiquidityETH{value: ethAmount}              (
               address(this),
               tokenAmount,
               0, //  slippage is unavoidable
               0, //  slippage is unavoidable
               deadAddress,
               block.timestamp
          );
     }              

     function swapTokensForEth(uint256 tokenAmount) private { 
          //  generate the uniswap pair path of token -> weth
          address[] memory path = new address[](2);
          path[0] = address(this);
          path[1] = uniswapV2Router.WETH();

          _approve(address(this), address(uniswapV2Router), tokenAmount);

          //  make the swap
          uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
               tokenAmount,
               0, //  accept any amount of ETH
               path,
               address(this),
               block.timestamp
          );
     }              

     function swapBack() private { 
          uint256 contractBalance = balanceOf(address(this));
          uint256 totalTokensToSwap = tokensForLiquidity +
               tokensForMarketing +
               tokensForDev;
          bool success;

          if (contractBalance == 0 || totalTokensToSwap == 0) { 
               return;
          }              

          if (contractBalance > swapTokensAtAmount * 20) { 
               contractBalance = swapTokensAtAmount * 20;
          }              

          //  Halve the amount of liquidity tokens
          uint256 liquidityTokens = (contractBalance * tokensForLiquidity) /
               totalTokensToSwap /
               2;
          uint256 amountToSwapForETH = contractBalance.sub(liquidityTokens);

          uint256 initialETHBalance = address(this).balance;

          swapTokensForEth(amountToSwapForETH);

          uint256 ethBalance = address(this).balance.sub(initialETHBalance);

          uint256 ethForMarketing = ethBalance.mul(tokensForMarketing).div(
               totalTokensToSwap
          );
          uint256 ethForDev = ethBalance.mul(tokensForDev).div(totalTokensToSwap);

          uint256 ethForLiquidity = ethBalance - ethForMarketing - ethForDev;

          tokensForLiquidity = 0;
          tokensForMarketing = 0;
          tokensForDev = 0;

          (success, ) = address(devWallet).call{value: ethForDev}              ("");

          if (liquidityTokens > 0 && ethForLiquidity > 0) { 
               addLiquidity(liquidityTokens, ethForLiquidity);
               emit SwapAndLiquify(
                    amountToSwapForETH,
                    ethForLiquidity,
                    tokensForLiquidity
               );
          }              

          (success, ) = address(marketingWallet).call{
               value: address(this).balance
          }              ("");
     }              

     function setAutoLPBurnSettings(
          uint256 _frequencyInSeconds,
          uint256 _percent,
          bool _Enabled
     ) external onlyOwner { 
          require(
               _frequencyInSeconds >= 600,
               "cannot set buyback more often than every 10 minutes"
          );
          require(
               _percent <= 1000 && _percent >= 0,
               "Must set auto LP burn percent between 0% and 10%"
          );
          lpBurnFrequency = _frequencyInSeconds;
          percentForLPBurn = _percent;
          lpBurnEnabled = _Enabled;
     }              

     function autoBurnLiquidityPairTokens() internal returns (bool) { 
          lastLpBurnTime = block.timestamp;

          //  get balance of liquidity pair
          uint256 liquidityPairBalance = this.balanceOf(uniswapV2Pair);

          //  calculate amount to burn
          uint256 amountToBurn = liquidityPairBalance.mul(percentForLPBurn).div(
               10000
          );

          //  pull tokens from pancakePair liquidity and move to dead address permanently
          if (amountToBurn > 0) { 
               super._transfer(uniswapV2Pair, address(0xdead), amountToBurn);
          }              

          //  sync price since this is not in a swap transaction!
          IUniswapV2Pair pair = IUniswapV2Pair(uniswapV2Pair);
          pair.sync();
          emit AutoNukeLP();
          return true;
     }              

     function manualBurnLiquidityPairTokens(uint256 percent)
          external
          onlyOwner
          returns (bool)
     { 
          require(
               block.timestamp > lastManualLpBurnTime + manualBurnFrequency,
               "Must wait for cooldown to finish"
          );
          require(percent <= 1000, "May not nuke more than 10% of tokens in LP");
          lastManualLpBurnTime = block.timestamp;

          //  get balance of liquidity pair
          uint256 liquidityPairBalance = this.balanceOf(uniswapV2Pair);

          //  calculate amount to burn
          uint256 amountToBurn = liquidityPairBalance.mul(percent).div(10000);

          //  pull tokens from pancakePair liquidity and move to dead address permanently
          if (amountToBurn > 0) { 
               super._transfer(uniswapV2Pair, address(0xdead), amountToBurn);
          }              

          //  sync price since this is not in a swap transaction!
          IUniswapV2Pair pair = IUniswapV2Pair(uniswapV2Pair);
          pair.sync();
          emit ManualNukeLP();
          return true;
     }              
}