fn truncate_empty_str_suffix<'a>(list: &'a [&'a str]) -> &'a [&'a str] {
    let mut last_ind=0;
    for (i,elem) in list.iter().enumerate() {
        if !elem.is_empty() {
            last_ind=i+1;
        }
    }
    &list[..last_ind]
}

fn main() {
    println!("{:?}", truncate_empty_str_suffix(&["", "bar", "", ""]));
}