## matrix_multiplication
### Instructions
- Define a `struct` named `Matrix` as a tuple of two tuples. The nested tuple will contain two `i32` .
- Create a **function** named `multiply` that receives a `Matrix` and an `i32` and returns the `Matrix` with each number multiplied by the second argument.
```rust
pub fn multiply(m: Matrix, multiplier: i32) -> Matrix {
}
```
`Matrix` must implement `Debug` , `PartialEq` and `Eq` . You can use `derive` .
> Remember that you are defining a library, so any element that can be called from an external crate must be made public.
### Usage
Here is a possible program to test your function
```rust
use matrix_multiplication::*;
fn main() {
let matrix = Matrix((1, 3), (4, 5));
println!("Original matrix {:?}", matrix);
println!("Matrix after multiply {:?}", multiply(matrix, 3));
}
```
And its output:
```console
$ cargo run
Original matrix Matrix ((1, 3), (4, 5))
Matrix after multiply ((3, 9), (12, 15))
$
```
### Notions
- [Defining a struct ](https://doc.rust-lang.org/stable/book/ch05-01-defining-structs.html )
- [The Tuple Type ](https://doc.rust-lang.org/stable/book/ch03-02-data-types.html )
- [Tuples ](https://doc.rust-lang.org/rust-by-example/primitives/tuples.html )
- [Tuple Structs without Named Fields ](https://doc.rust-lang.org/stable/book/ch05-01-defining-structs.html )
- [Adding Useful Functionality with Derived Traits ](https://doc.rust-lang.org/stable/book/ch05-02-example-structs.html )
- [Chapter 7 ](https://doc.rust-lang.org/stable/book/ch07-03-paths-for-referring-to-an-item-in-the-module-tree.html )
