Function min_max_by_key 

fn min_max_by_key<T: Copy, K: Copy + Ord, const LANES: usize>(
    values: &[T],
    key: impl Fn(T) -> K,
    key_min: K,
    key_max: K,
) -> Option<(K, K)>

Returns the minimum and maximum of values after mapping them with key, or None if values is empty.