# LibERC20

function decimals(address _token) internal returns (uint8);

function symbol(address _token) internal returns (string memory);

function balanceOf(address _token, address _who) internal returns (uint256);

function transferFrom(address _token, address _from, address _to, uint256 _value) internal;

function transfer(address _token, address _to, uint256 _value) internal;

function handleReturn(bool _success, bytes memory _result) internal pure;

function _assertNotEmptyContract(address _token) internal view;