mod_trait_exerci 0.2.1

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## Getting Started
- Learn the crate [hello_exercism](https://crates.io/crates/hello_exercism)

## The Rust Feature trait and impl
<img src="https://github.com/cnruby/learn-rust-by-crates/blob/master/docs/zh-first-volumn/src/images/hello_mod_trait_00_structure.png?raw=true"/>

# Crate
- crate name: mod_trait_exerci
- folder name: lib-hello
- description: how to understand the rust feature trait with mod

## create the crate `mod_trait_exerci`
```bash
mkdir lib-hello && cd lib-hello
cargo init --name mod_trait_exerci --lib
```

## References
- [RustConf 2019 - The Rust 2018 Module System by Josh Triplett](https://www.youtube.com/watch?v=AN9FoZgLcFg&feature=youtu.be)