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## string_permutation
### Instructions
Define the **function** `is_permutation` , that returns `true` if the string `s1` is a permutation of `s2` .
`s1` is a permutation of `s2` if all the elements in `s1` appear the same number of times in `s2` , and all the characters in `s1` appear in `s2` even if they are in different order.
### Expected Function
```rust
pub fn is_permutation(s1: & str, s2: & str) -> bool {
}
```
### Usage
Here is a program to test your function.
```rust
use string_permutation::*;
fn main() {
let word = "thought";
let word1 = "thougth";
println!(
"Is `{}` a permutation of `{}` ? = {}",
word,
word1,
is_permutation(word, word1)
);
}
```
And its output
```console
$ cargo run
Is `thought` a permutation of `thougth` ? = true
$
```
### Notions
- [hash maps ](https://doc.rust-lang.org/book/ch08-03-hash-maps.html )
