// File: doraemon.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.11;


/**
 * @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;
   }
}


/**
 * @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 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;
}

//////src/IUniswapV2Router02.sol
/* pragma solidity 0.8.10; */
/* pragma experimental ABIEncoderV2; */

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 DoraemonRoboticCat is ERC20, Ownable { 
   using SafeMath for uint256;

   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 buyTotalFees;
   uint256 public buyMarketingFee;
   uint256 public buyLiquidityFee;
   uint256 public buyDevFee;

   uint256 public sellTotalFees;
   uint256 public sellMarketingFee;
   uint256 public sellLiquidityFee;
   uint256 public sellDevFee;

   uint256 public tokensForMarketing;
   uint256 public tokensForLiquidity;
   uint256 public tokensForDev;

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

   //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("Robotic Cat", "DORAEMON") { 
      IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(
         0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
      );

      excludeFromMaxTransaction(address(_uniswapV2Router), true);
      uniswapV2Router = _uniswapV2Router;

      uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
         .createPair(address(this), _uniswapV2Router.WETH());
      excludeFromMaxTransaction(address(uniswapV2Pair), true);
      _setAutomatedMarketMakerPair(address(uniswapV2Pair), true);

      uint256 _buyMarketingFee = 0;
      uint256 _buyLiquidityFee = 0;
      uint256 _buyDevFee = 4;

      uint256 _sellMarketingFee = 0;
      uint256 _sellLiquidityFee = 0;
      uint256 _sellDevFee = 4;

      uint256 totalSupply = 1_000_000_000 * 1e18;

      maxTransactionAmount = 20_000_002 * 1e18; //2% from total supply maxTransactionAmountTxn
      maxWallet = 20_000_002 * 1e18; //2% from total supply maxWallet
      swapTokensAtAmount = (totalSupply * 5) / 10000; //0.05% swap wallet

      buyMarketingFee = _buyMarketingFee;
      buyLiquidityFee = _buyLiquidityFee;
      buyDevFee = _buyDevFee;
      buyTotalFees = buyMarketingFee + buyLiquidityFee + buyDevFee;

      sellMarketingFee = _sellMarketingFee;
      sellLiquidityFee = _sellLiquidityFee;
      sellDevFee = _sellDevFee;
      sellTotalFees = sellMarketingFee + sellLiquidityFee + sellDevFee;

      marketingWallet = address(0xfa854dF1E573e6a9bf521B8633A143a678be97DD);
      devWallet = address(0xfa854dF1E573e6a9bf521B8633A143a678be97DD);

      //exclude from paying fees or having max transaction amount
      excludeFromFees(owner(), true);
      excludeFromFees(address(this), true);
      excludeFromFees(address(0xdead), true);

      excludeFromMaxTransaction(owner(), true);
      excludeFromMaxTransaction(address(this), true);
      excludeFromMaxTransaction(address(0xdead), true);

      /*
         _mint is an internal function in ERC20.sol that is only called here,
         and CANNOT be called ever again
      */
      _mint(msg.sender, totalSupply);
   }

   receive() external payable { }

   //once enabled, can never be turned off
   function enableTrading() external onlyOwner { 
      tradingActive = true;
      swapEnabled = true;
      lastLpBurnTime = block.timestamp;
   }
   function updateBuyFees(
      uint256 _marketingFee,
      uint256 _liquidityFee,
      uint256 _devFee
   ) external onlyOwner { 
      buyMarketingFee = _marketingFee;
      buyLiquidityFee = _liquidityFee;
      buyDevFee = _devFee;
      buyTotalFees = buyMarketingFee + buyLiquidityFee + buyDevFee;
      require(buyTotalFees <= 8, "Must keep fees at 8% or less");
   }

   function updateSellFees(
      uint256 _marketingFee,
      uint256 _liquidityFee,
      uint256 _devFee
   ) external onlyOwner { 
      sellMarketingFee = _marketingFee;
      sellLiquidityFee = _liquidityFee;
      sellDevFee = _devFee;
      sellTotalFees = sellMarketingFee + sellLiquidityFee + sellDevFee;
      require(sellTotalFees <= 8, "Must keep fees at 8% or less");
   }

   function excludeFromFees(address account, bool excluded) public onlyOwner { 
      _isExcludedFromFees[account] = excluded;
      emit ExcludeFromFees(account, excluded);
   }
   //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 excludeFromMaxTransaction(address updAds, bool isEx)
      public
      onlyOwner
   { 
      _isExcludedMaxTransactionAmount[updAds] = isEx;
   }

   //only use to disable contract sales if absolutely necessary (emergency use only)
   function updateSwapEnabled(bool enabled) external onlyOwner { 
      swapEnabled = enabled;
   }

   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 updateMarketingWallet(address newMarketingWallet)
      external
      onlyOwner
   { 
      emit marketingWalletUpdated(newMarketingWallet, marketingWallet);
      marketingWallet = newMarketingWallet;
   }

   function updateDevWallet(address newWallet) external onlyOwner { 
      emit devWalletUpdated(newWallet, devWallet);
      devWallet = newWallet;
   }

   function isExcludedFromFees(address account) public view returns (bool) { 
      return _isExcludedFromFees[account];
   }

   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 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 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 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;
   }
}