interface IERC20Metadata  {
        /**
         * @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);
    }
/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
function symbol() external view returns (string memory);
/**
 * @dev Returns the symbol of the token.
 */