Audit-smart-contracts-catlovers

[Catlovers351]

Nama token:cat lovers
Simbol:CAT LOVERS
desimal:18
Suplay:1000000000
Tax:0%

/**
*Submitted for verification at BscScan.com on 2021-11-21
*/

// Dependency file: @openzeppelin/contracts/token/ERC20/IERC20.sol

// SPDX-License-Identifier: MIT

// pragma solidity ^0.8.0;

/**

• @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:
  • ERC: Token standard ethereum/EIPs#20 (comment)
  • 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);
    }

// Dependency file: @openzeppelin/contracts/utils/Context.sol

// pragma solidity ^0.8.0;

/**

• @dev Provides information about the current execution context, including the

• sender of the transaction and its data. While these are generally available

• via msg.sender and msg.data, they should not be accessed in such a direct

• manner, since when dealing with meta-transactions the account sending and

• paying for execution may not be the actual sender (as far as an application

• is concerned).

• This contract is only required for intermediate, library-like contracts.
  */
  abstract contract Context {
  function _msgSender() internal view virtual returns (address) {
  return msg.sender;
  }

  function _msgData() internal view virtual returns (bytes calldata) {
  return msg.data;
  }
  }

// Dependency file: @openzeppelin/contracts/access/Ownable.sol

// pragma solidity ^0.8.0;

// import "@openzeppelin/contracts/utils/Context.sol";

/**

• @dev Contract module which provides a basic access control mechanism, where

• there is an account (an owner) that can be granted exclusive access to

• specific functions.

• By default, the owner account will be the one that deploys the contract. This

• can later be changed with {transferOwnership}.

• This module is used through inheritance. It will make available the modifier

• onlyOwner, which can be applied to your functions to restrict their use to

• the owner.
  */
  abstract contract Ownable is Context {
  address private _owner;

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

  /**

  • @dev Initializes the contract setting the deployer as the initial owner.
    */
    constructor() {
    _setOwner(_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 {
    _setOwner(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");
    _setOwner(newOwner);
    }

  function _setOwner(address newOwner) private {
  address oldOwner = _owner;
  _owner = newOwner;
  emit OwnershipTransferred(oldOwner, newOwner);
  }
  }

// Dependency file: @openzeppelin/contracts/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 no longer needed starting with Solidity 0.8. 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: improve mul performance and reduce gas cost OpenZeppelin/openzeppelin-contracts#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;
      }
      }
      }

// Dependency file: contracts/BaseToken.sol

// pragma solidity =0.8.4;

enum TokenType {
standard,
antiBotStandard,
liquidityGenerator,
antiBotLiquidityGenerator,
baby,
antiBotBaby,
buybackBaby,
antiBotBuybackBaby
}

abstract contract BaseToken {
event TokenCreated(
address indexed owner,
address indexed token,
TokenType tokenType,
uint256 version
);
}

// Root file: contracts/standard/StandardToken.sol

pragma solidity =0.8.4;

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

contract StandardToken is IERC20, Ownable, BaseToken {
using SafeMath for uint256;

uint256 public constant VERSION = 1;

mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;

string private _name;
string private _symbol;
uint8 private _decimals;
uint256 private _totalSupply;

constructor(
    string memory name_,
    string memory symbol_,
    uint8 decimals_,
    uint256 totalSupply_,
    address serviceFeeReceiver_,
    uint256 serviceFee_
) payable {
    _name = name_;
    _symbol = symbol_;
    _decimals = decimals_;
    _mint(owner(), totalSupply_);

    emit TokenCreated(owner(), address(this), TokenType.standard, VERSION);

    payable(serviceFeeReceiver_).transfer(serviceFee_);
}

/**
 * @dev Returns the name of the token.
 */
function name() public view virtual returns (string memory) {
    return _name;
}

/**
 * @dev Returns the symbol of the token, usually a shorter version of the
 * name.
 */
function symbol() public view virtual 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 {_setupDecimals} is
 * called.
 *
 * 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 returns (uint8) {
    return _decimals;
}

/**
 * @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);
    _approve(
        sender,
        _msgSender(),
        _allowances[sender][_msgSender()].sub(
            amount,
            "ERC20: transfer amount exceeds allowance"
        )
    );
    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].add(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)
{
    _approve(
        _msgSender(),
        spender,
        _allowances[_msgSender()][spender].sub(
            subtractedValue,
            "ERC20: decreased allowance below zero"
        )
    );
    return true;
}

/**
 * @dev Moves tokens `amount` from `sender` to `recipient`.
 *
 * This is 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);

    _balances[sender] = _balances[sender].sub(
        amount,
        "ERC20: transfer amount exceeds balance"
    );
    _balances[recipient] = _balances[recipient].add(amount);
    emit Transfer(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:
 *
 * - `to` 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 = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(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);

    _balances[account] = _balances[account].sub(
        amount,
        "ERC20: burn amount exceeds balance"
    );
    _totalSupply = _totalSupply.sub(amount);
    emit Transfer(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 Sets {decimals} to a value other than the default one of 18.
 *
 * WARNING: This function should only be called from the constructor. Most
 * applications that interact with token contracts will not expect
 * {decimals} to ever change, and may work incorrectly if it does.
 */
function _setupDecimals(uint8 decimals_) internal virtual {
    _decimals = decimals_;
}

/**
 * @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 to 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 {}

}