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## reverse_string
### Instructions
Write a function `rev_str` that takes a `&str` as a parameter, and returns a string with its words reversed.
### Expected Functions
```rust
pub fn rev_str(input: &str) -> String {
}
```
### Usage
Here is a possible program to test your function :
```rust
use reverse_string::rev_str;
fn main() {
println!("{}", rev_str("Hello, world!"));
println!("{}", rev_str("Hello, my name is Roman"));
println!("{}", rev_str("I have a nice car!"));
println!("{}", rev_str("How old are You"));
println!("{}", rev_str("ex: this is an example água"));
}
```
And it's output:
```console
student@ubuntu:~/[[ROOT]]/test$ cargo run
!dlrow ,olleH
namoR si eman ym ,olleH
!rac ecin a evah I
uoY era dlo woH
augá elpmaxe na si siht :xe
student@ubuntu:~/[[ROOT]]/test$
```