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## matrix_multiplication
### Instructions
- Define a `struct` named `Matrix` as a tuple of 2 tuples. The nested tuple will contain 2 `i32`s.
- 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, val: 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::multiply;
use matrix_multiplication::Matrix;
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)