软件箧some_exerci

重要参考资料

• https://blog.codeship.com/understanding-rust-loops/

参考资料

• how-to-match-a-string-against-string-literals-in-rust
• rust-quickie-matching-strings
• rust-patterns-ref
• elegant-way-to-borrow-and-return-a-mutable-reference-in-rust
• https://stackoverflow.com/questions/53511591/is-it-possible-to-unborrow-a-mutable-reference-in-rust