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## matrix_display
### Instructions
Complete the `Matrix` struct below.
You will need to create the `new` associated function which initializes the struct.
You will also need to implement the `std::fmt::Display` trait, so that it prints like the example in the usage.
### 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
use matrix_display::*;
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)
$
```