Now that we have the interface and library smart contracts that we need to create our main ERC-20 token smart contract, we will now move on to creating some of the smart contracts that provide additional functionality for the ERC-20 token smart contract. These smart contracts will build on the ERC-20 token standard we are implementing. The ERC-20 token standard does not cover these additional capabilities as they are not required to create an ERC-20 smart contract token. In the next section, we will explore why we are adding these additional capabilities to the smart contract token that we are writing in this book. Once these contracts are implemented, we will have everything we need to create the ERC-20 smart contract token we will send to the Ethereum blockchain.