fn largest<T: PartialOrd + Copy>(list: &[T]) -> T {
    let mut largest = list[];

    for &item in list.iter() {
    if item > largest {
        largest = item;
    }
    }

    largest
} 

fn main() {
    let number_list = vec![, , , , ];
    let result = largest(&number_list);
    println!("The largest number is {}", result);

    let char_list = vec!['r', 'a', 'v', 'm', 'd'];
    let result = largest(&char_list);
    println!("The largest char is {}", result);
}