DogeKing is an ERC20 standard smart contract that beginners can use to learn Solidity. This contract mian constructure will teach us how to design smart contracts, which will help me write excellent smart contracts in the future.This DogeKing smart contract using interface, library, abstract contract, enum. And using ‘is‘ to inherit parent’s feature.There are so many librarys we can use in our projects.Reading those code, it' will make me re-acquainted solidity language feature about Int...