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## rot21
### Instructions
The purpose of this exercise is to create a `rot21` function that works like the ROT13 cipher.
This function will receive a `string` and it will rotate each letter of that `string` 21 times to the right.
The function should only rotate letters. If the string includes punctuation, symbols and/or numbers
they will remain the same.
### Expected functions
```rust
pub fn rot21(input: &str) -> String {
}
```
### Usage
Here is a program to test your function.
```rust
use rot21::rot21;
fn main() {
println!("The letter \"a\" becomes: {}", rot21("a"));
println!("The letter \"m\" becomes: {}", rot21("m"));
println!("The word \"MISS\" becomes: {}", rot21("MISS"));
println!("Your cypher wil be: {}", rot21("Testing numbers 1 2 3"));
println!("Your cypher wil be: {}", rot21("rot21 works!"));
}
```
And its output:
```console
$ cargo run
The letter "a" becomes: v
The letter "m" becomes: h
The word "MISS" becomes: HDNN
Your cypher wil be: Oznodib iphwzmn 1 2 3
Your cypher wil be: mjo21 rjmfn!
$
```