use algorithmz::string::reverse_vowels;
#[test]
fn test_reverse_vowels_empty() {
let result = reverse_vowels("");
assert_eq!(result, Err(String::from("Cannot reverse vowels of an empty string!")));
}
#[test]
fn test_reverse_vowels() {
let result = reverse_vowels("hello");
assert_eq!(result, Ok(String::from("holle")));
}