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## rgb_match
### Instructions
Implement the struct `Color` with the function `swap`.
This function must allow you to swap the values of the struct.
### Notions
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- [patterns](https://doc.rust-lang.org/book/ch18-00-patterns.html)
### Expected functions
```rust
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pub struct Color {
pub r: u8,
pub g: u8,
pub b: u8,
pub a: u8,
}
impl Color {
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pub fn swap(mut self, first: u8, second: u8) -> Color {
}
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}
```
### Usage
Here is a program to test your function.
```rust
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use rgb_match::*;
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));
}
```
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And its output:
```console
$ 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 }
$
```