exercism 0.1.9

My exercism
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

pub fn raindrops(n: u32) -> String {
    let mut raindrop = String::new();

    if n % 3 == 0 {
        raindrop += "Pling";
    }

    if n % 5 == 0 {
        raindrop += "Plang";
    }

    if n % 7 == 0 {
        raindrop += "Plong";
    }

    if raindrop.is_empty() {
        raindrop = n.to_string();
    }

    raindrop
}