public/subjects/rgb_match/README.md

## rgb_match

### Instructions

Implement the struct `Color` with the function `swap`.
This function must allow you to swap the values of the struct.

### Notions

- https://doc.rust-lang.org/book/ch18-00-patterns.html

### Expected functions

```rust
impl Color {
    pub fn swap(mut self, first: u8, second: u8) -> Color {}
    }
```

### Usage

Here is a program to test your function.

```rust
use rgb_match::rgb_match;

struct Color {
    r: u8,
    g: u8,
    b: u8,
    a: u8,
}

fn main() {
    let c = Color {
        r: 255,
        g: 200,
        b: 10,
        a: 30,
    };

    println!("{:?}", c.swap(c.r, c.b));
    println!("{:?}", c.swap(c.r, c.g));
    println!("{:?}", c.swap(c.r, c.a));
    println!();
    println!("{:?}", c.swap(c.g, c.r));
    println!("{:?}", c.swap(c.g, c.b));
    println!("{:?}", c.swap(c.g, c.a));
    println!();
    println!("{:?}", c.swap(c.b, c.r));
    println!("{:?}", c.swap(c.b, c.g));
    println!("{:?}", c.swap(c.b, c.a));
    println!();
    println!("{:?}", c.swap(c.a, c.r));
    println!("{:?}", c.swap(c.a, c.b));
    println!("{:?}", c.swap(c.a, c.g));
}
```

And its output

```console
student@ubuntu:~/[[ROOT]]/test$ cargo run
Color { r: 10, g: 200, b: 255, a: 30 }
Color { r: 200, g: 255, b: 10, a: 30 }
Color { r: 30, g: 200, b: 10, a: 255 }

Color { r: 200, g: 255, b: 10, a: 30 }
Color { r: 255, g: 10, b: 200, a: 30 }
Color { r: 255, g: 30, b: 10, a: 200 }

Color { r: 10, g: 200, b: 255, a: 30 }
Color { r: 255, g: 10, b: 200, a: 30 }
Color { r: 255, g: 200, b: 30, a: 10 }

Color { r: 30, g: 200, b: 10, a: 255 }
Color { r: 255, g: 200, b: 30, a: 10 }
Color { r: 255, g: 30, b: 10, a: 200 }

student@ubuntu:~/[[ROOT]]/test$
```