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## matrix_display
### Instructions
Use the Matrix struct given in the [expected struct ](#expected-functions-and-struct ) and implement the `std::fmt::Display` trait so it prints the matrix like in the [usage ](#usage ).
The associated function `new` that creates a matrix from a slice of slices also has to be implemented.
### Expected Functions and Struct
```rust
pub struct Matrix(pub Vec< Vec < i32 > >);
impl Matrix {
pub fn new(slice: & [& [i32]]) -> Self {
}
}
use std::fmt;
impl fmt::Display for Matrix {
}
```
### Usage
Here is a possible program to test your function
```rust
fn main() {
let matrix = Matrix::new(& [& [1, 2, 3], & [4, 5, 6], & [7, 8, 9]]);
println!("{}", matrix);
}
```
And it's output:
```console
$ cargo run
(1 2 3)
(4 5 6)
(7 8 9)
$
```
