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## groceries
### Instructions
Create a **function** called `insert` that inserts a new element at the end of the `Vec`.
And another **function** `at_index` that returns the value found at the index passed as an argument.
### Notions
- [Common Collections](https://doc.rust-lang.org/stable/book/ch08-00-common-collections.html)
- [Vectors]https://doc.rust-lang.org/stable/book/ch08-01-vectors.html)
### Expected Functions
```rust
pub fn insert(vec: &mut Vec<String>, val: String) {
}
pub fn at_index(vec: &Vec<String>, index: usize) -> String {
}
```
### Usage
Here is a possible program to test your function:
```rust
use groceries::{insert, at_index};
fn main() {
let mut groceries = vec![
"yogurt".to_string(),
"panetone".to_string(),
"bread".to_string(),
"cheese".to_string(),
];
insert(&mut groceries, String::from("nuts"));
println!("The groceries list now = {:?}", &groceries);
println!(
"The second element of the grocery list is {:?}",
at_index(&groceries, 1)
);
}
```
And its output:
```console
student@ubuntu:~/[[ROOT]]/test$ cargo run
The groceries list now = ["yogurt", "panetone", "bread", "cheese", "nuts"]
The second element of the grocery list is "panetone"
student@ubuntu:~/[[ROOT]]/test$
```