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## is_anagram
### Instructions
Write a function called `is_anagram` that checks if one string is an anagram of another string. An anagram is a word or phrase formed by rearranging the letters of another, such as "listen" and "silent."
```rust
pub fn is_anagram(s1: &str, s2: &str) -> bool {
// Your code goes here
}
```
- `s1: &str`: The first input string.
- `s2: &str`: The second input string.
The function should return `true` if `s1` is an anagram of `s2`, and `false` otherwise.
Your task is to implement the `is_anagram` function to determine whether the two input strings are anagrams of each other.
### Usage
Here is a possible runner to test your function:
```rust
use is_anagram::is_anagram;
fn main() {
let s1 = "listen";
let s2 = "silent";
if is_anagram(s1, s2) {
println!("{} and {} are anagrams!", s1, s2);
} else {
println!("{} and {} are not anagrams.", s1, s2);
}
}
```
And its output:
```console
$ cargo run
listen and silent are anagrams!
```