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## searching
### Instructions
In this exercise you will have to complete the function `search`.
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This **function** receives an array and a key of `i32`, then it will return the position
of the given key in the array.
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Only arrays with uniques keys will be tested.
### Notions
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- [patterns](https://doc.rust-lang.org/book/ch18-00-patterns.html)
### Expected functions
```rust
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pub fn search(array: &[i32], key: i32) -> Option<usize> {
}
```
### Usage
Here is a program to test your function.
```rust
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use searching::*;
fn main() {
let ar = [1, 3, 4, 6, 8, 9, 11];
let f = search(&ar, 6);
println!(
"the element 6 is in the position {:?} in the array {:?}",
f, ar
);
}
```
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And its output:
```console
$ cargo run
the element 6 is in the position Some(3) in the array [1, 3, 4, 6, 8, 9, 11]
$
```