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## string_permutation
### Instructions
Define the **function** `is_permutation`, that returns `true` if the string `s1` is a permutation of `s2`.
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`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
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pub fn is_permutation(s1: &str, s2: &str) -> bool {
}
```
### Usage
Here is a program to test your function.
```rust
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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)