Terra链 “猜单双” 智能合约 这是参考 Terra 官网教程 写的"猜单双"智能合约例子 参考资料： https://docs.rs/cosmwasm-std/latest/cosmwasm_std/index.html https://docs.cosmwasm.com/docs/1.0/smart-contracts/entry-points/ https://github.com/InterWasm/cw-contracts