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## Highest
### Instructions
In this exercise, a `Numbers` struct will be given.
These methods have to be written for it:
- `new`: create a new instance of `Number`.
- `List`: which returns an `array` with every number in the struct.
- `Latest`: which returns an `Option<u32>` with the last added number.
- `Highest`: which returns an `Option<u32>` with the highest number from the list.
- `Highest_Three`: which returns a `Vec<u32>` with the three highest numbers.
### Expected functions
```rust
pub fn new(&[u32]) -> Self {}
pub fn list(&self) -> &[u32] {}
pub fn latest(&self) -> Option<u32> {}
pub fn highest(&self) -> Option<u32> {}
pub fn highest_three(&self) -> Vec<u32> {}
```
### Usage
Here is a program to test your function.
```rust
use highest::*;
#[derive(Debug)]
struct Numbers<'a> {
numbers: &'a [u32],
}
fn main() {
let expected = [30, 500, 20, 70];
let n = Numbers::new(&expected);
println!("{:?}", n.list());
println!("{:?}", n.highest());
println!("{:?}", n.latest());
println!("{:?}", n.highest_three());
}
```
And its output:
```console
$ cargo run
[30, 500, 20, 70]
Some(500)
Some(70)
[500, 70, 30]
$
```
### Notions
- [Trait iterator](https://doc.rust-lang.org/std/iter/trait.Iterator.html)