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// SPDX-License-Identifier: MIT

/**
 * Welcome to the BullZilla Smart Contract
 * The ultimate meme coin combining strength and community.
 * 
 * Official Links:
 * Website: www.bullzilla.com
 * X (Twitter): https://x.com/BullZillaCoin
 * Telegram: https://t.me/OfficialBullZilla
 * CoinMarketCap: https://coinmarketcap.com/community/profile/BullZilla/
 * 
 * For any support queries, please reach out via our official Telegram.
 */

pragma solidity 0.8.20;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/Context.sol";

contract BullZilla is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private constant _totalSupply = 159_999_999_910 * 10**18;
    string private constant _name = "BullZilla";
    string private constant _symbol = "$BZIL";
    uint8 private constant _decimals = 18;

    error BullRageExceeded();
    error NoZillaZone();
    error InsufficientBullPower();
    error BullChargeRequired();

    constructor() {
        _mint(_msgSender(), _totalSupply);
    }

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

    function transfer(address to, uint256 amount) external virtual override returns (bool) {
        address bullHolder = _msgSender();
        _transfer(bullHolder, to, amount);
        return true;
    }

    function increaseAllowance(
        address spender, 
        uint256 addedValue
    ) external virtual returns (bool) {
        address bullHolder = _msgSender();
        _approve(bullHolder, spender, _allowances[bullHolder][spender] + addedValue);
        return true;
    }

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

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

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

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

    function decreaseAllowance(
        address spender, 
        uint256 subtractedValue
    ) external virtual returns (bool) {
        address bullHolder = _msgSender();
        uint256 currentAllowance = _allowances[bullHolder][spender];
        if (currentAllowance < subtractedValue) revert BullRageExceeded();
        unchecked {
            _approve(bullHolder, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

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

    function approve(address spender, uint256 amount) external virtual override returns (bool) {
        address bullHolder = _msgSender();
        _approve(bullHolder, spender, amount);
        return true;
    }

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

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        if (from == address(0)) revert NoZillaZone();
        if (to == address(0)) revert NoZillaZone();
        uint256 bullStrength = _balances[from];
        if (bullStrength < amount) revert InsufficientBullPower();
        unchecked {
            _balances[from] = bullStrength - amount;
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        if (account == address(0)) revert NoZillaZone();
        unchecked {
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);
    }

    function _approve(
        address tokenOwner,
        address spender,
        uint256 amount
    ) internal virtual {
        if (tokenOwner == address(0)) revert NoZillaZone();
        if (spender == address(0)) revert NoZillaZone();

        _allowances[tokenOwner][spender] = amount;
        emit Approval(tokenOwner, spender, amount);
    }

    function _spendAllowance(
        address tokenOwner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = _allowances[tokenOwner][spender];
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < amount) revert BullChargeRequired();
            unchecked {
                _approve(tokenOwner, spender, currentAllowance - amount);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity >=0.6.2;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC-20 standard.
 */
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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• SolidProof - Aug 21st, 2025 - Security Audit Report

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