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## collect
### Instructions
Implement the **function** `bubble_sort` , which receives a `Vec<i32>` and returns the same vector but in increasing order using the bubble sort algorithm.
### Expected Function
```rust
pub fn bubble_sort(vec: & mut Vec< i32 > ) {
}
```
### Usage
Here is a program to test your function.
```rust
use collect::*;
fn main() {
let ref mut v = vec![3, 2, 4, 5, 1, 7];
let mut b = v.clone();
bubble_sort(v);
println!("{:?}", v);
b.sort();
println!("{:?}", b);
}
```
And its output:
```console
$ cargo run
[1, 2, 3, 4, 5, 7]
[1, 2, 3, 4, 5, 7]
$
```
