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## get_products
### Instructions
Create a function `get_products` that takes a vector of integers, and returns a vector of the products
of each index. For this exercise to be correct you will have to return the product of every index
except the current one.
Examples: [1,2,3,4]
- for the number `1` we get `2*3*4 = 24`
- for the number `3` we get `1*2*4 = 8`
### Notions
- [Trait iterator](https://doc.rust-lang.org/std/iter/trait.Iterator.html)
### Expected functions
```rust
pub fn get_products(arr: Vec<usize>) -> Vec<usize> {
}
```
### Usage
Here is a program to test your function.
```rust
use get_products::get_products;
fn main() {
let arr: Vec<usize> = vec![1, 7, 3, 4];
let output = get_products(arr);
println!("{:?}", output);
}
```
And its output:
```console
$ cargo run
[84, 12, 28, 21]
$
```