# Open Zeppelin Contracts

This is a sample project of [OpenZeppelin contracts](https://openzeppelin.com/contracts/).

## Smart Contracts

- **contracts/GLDToken.sol**: a smart contract implements [ERC-20](https://docs.openzeppelin.com/contracts/4.x/erc20).
- **contracts/GameItem.sol**: a smart contract implements [ERC-721](https://docs.openzeppelin.com/contracts/4.x/erc721).
- **contracts/GameItems.sol**: a smart contract implements [ERC-1155](https://docs.openzeppelin.com/contracts/4.x/erc1155).

## Reference

- GitHub: https://github.com/OpenZeppelin/openzeppelin-contracts
- Documentation: https://docs.openzeppelin.com/contracts

npm install @openzeppelin/contracts

truffle-flattener contracts/ShuiJing.sol > ShuiJing.sol