## fibonacci2

### Instructions

Complete the body of the **function** `fibonacci`.

```rust
 pub fn fibonacci(n: u32) -> u32 {
 }
```

This function receives a number `n` and returns the `n`th number in the fibonacci series.

The Fibonacci Series starts like this: 0, 1, 1, 2, 3, 5, 8, 13 etc...

### Usag

Here is a possible test for your function:

```rust
use fibonacci2::fibonacci;

fn main() {
    println!("The element in the position {} in fibonacci series is {}",2, fibonacci(2));
    println!("The element in the position {} in fibonacci series is {}",4, fibonacci(4));
    println!("The element in the position {} in fibonacci series is {}",22, fibonacci(22));
    println!("The element in the position {} in fibonacci series is {}", 20, fibonacci(20));
}
```

And its output:

```console
$ cargo run
The element in the position 2 in fibonacci series is 1
The element in the position 4 in fibonacci series is 3
The element in the position 22 in fibonacci series is 17711
The element in the position 20 in fibonacci series is 6765
$
```

### Notions

- [Primitives](https://doc.rust-lang.org/stable/rust-by-example/primitives.html)
- [Functions](https://doc.rust-lang.org/stable/rust-by-example/fn.html)