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docs(reverse_string): correct grammar
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### Instructions
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### Instructions
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Write a **function** `rev_str` that takes a `&str` as a parameter, and returns a `String` with its letters reversed.
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Create a **function** named `rev_str` that takes a `&str` as a parameter, and returns a `String` with its letters reversed.
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### Notions
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- [Strings](https://doc.rust-lang.org/rust-by-example/std/str.html)
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- [Primitive Type str](https://doc.rust-lang.org/std/primitive.str.html)
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- [Primtive Type char](https://doc.rust-lang.org/std/primitive.char.html)
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- [Module std::string](https://doc.rust-lang.org/std/string/index.html)
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### Expected Functions
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```rust
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```rust
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pub fn rev_str(input: &str) -> String {
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pub fn rev_str(input: &str) -> String {
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@ -45,3 +37,10 @@ uoY era dlo woH
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augá elpmaxe na si siht :xe
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augá elpmaxe na si siht :xe
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$
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$
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```
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```
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### Notions
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- [Strings](https://doc.rust-lang.org/rust-by-example/std/str.html)
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- [Primitive Type str](https://doc.rust-lang.org/std/primitive.str.html)
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- [Primtive Type char](https://doc.rust-lang.org/std/primitive.char.html)
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- [Module std::string](https://doc.rust-lang.org/std/string/index.html)
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