add exercises for some chapters

3 years ago · 56d4825eb0
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 ## 2022-03-09
 - 在 [Deref 章节](https://course.rs/advance/smart-pointer/deref.html)中新增开篇引导示例，帮助读者更好的理解当前章节
 - 为部分章节增加[课后练习题链接](https://github.com/sunface/rust-by-practice)
 ## 2022-03-08