insert vecteur de rouille

/// Construction:
//  vector.insert(index: usize, element: T);
//  
/// Example:
fn main() {
    let mut v = vec![1,3];  //  create mutable vector
    v.insert(1,2);          //  insert 2 on index 1
    println!("{v:?}");      //  print result in the console
}
///	Output:
//	[1, 2, 3]
SnefDen