pragma solidity ^0.7.0; import { TokenInterface } from "../../common/interfaces.sol"; abstract contract Helpers { TokenInterface constant internal wethContract = TokenInterface(0x4200000000000000000000000000000000000006); TokenInterface constant internal wethFixContract = TokenInterface(0xa5044f8FfA8FbDdd0781cEDe502F1C493BB6978A); }