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## closures
### Instructions
Using closures and iterators create a **function**, that returns the first 50 even numbers squared in a `Vec<i32>`.
### Expected Functions
```rust
fn first_fifty_even_square() -> Vec<i32> {
}
```
### Usage
Here is a program to test your function.
```rust
use closures::*;
fn main() {
println!("Hello, world!");
let v1 = first_fifty_even_square();
println!("All elements in {:?}, len = {}", v1, v1.len());
}
```
And its output:
```console
$ cargo run
All elements in [4, 16, 36, ..., 10000], len = 50
$
```
### Notions
[Iterators and Closures](https://doc.rust-lang.org/book/ch13-00-functional-features.html)