trait_exerci 0.2.2

how to understand the trait for rust
Documentation 
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[![Minimum rustc version](https://img.shields.io/badge/rustc-1.38+-brightgreen)](https://github.com/rust-lang/rust)
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[![The Crate `hello_trait` Code](https://img.shields.io/badge/crate-code-yellowgreen)](https://github.com/cnruby/learn-rust-by-crates/tree/master/hello-trait)
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## The Rust Feature trait and impl
![image](./images/hello-trait-05-complex.png)

## About this Crate `hello_trait`
- Why to need the Rust Feature trait
- How to Understand the Rust Feature trait
- How to Understand the Rust Feature impl
- Was is the relation between trait and impl