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docs(min_and_max): add new rust exam exercise

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nprimo 2 years ago committed by Niccolò Primo
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      subjects/min_and_max/README.md

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subjects/min_and_max/README.md

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## min_and_max
### Instructions
Create a **function** named `min_and_max` that receives three `i32` and returns a `tuple` with the minimum and the maximum number received as input.
```rust
pub fn min_and_max(nb_1: i32, nb_2: i32, nb_3: i32) -> (i32, i32) {
}
```
### Usage
Here is a program to test your function
```rust
use min_and_max::min_and_max;
fn main() {
let nb_1 = 9;
let nb_2 = 4;
let nb_3 = 2;
let (min, max) = min_and_max(nb_1, nb_2, nb_3);
println!(
"The minimum is {}, the maximum is {}",
min, max
);
}
```
And its output
```console
$ cargo run
The minimum is 2, the maximum is 9
$
```
### Notions
- [The Tuple Type](https://doc.rust-lang.org/stable/book/ch03-02-data-types.html?highlight=accessing%20a%20tuple#compound-types)
- [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?highlight=tuple#using-tuple-structs-without-named-fields-to-create-different-types)
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