Function timecode 

pub fn timecode(total_secs: u64) -> String

Format a whole-second duration as a media timecode: m:ss under an hour, h:mm:ss at or above one hour.

use tilo_ui::format::timecode;
assert_eq!(timecode(0), "0:00");
assert_eq!(timecode(9), "0:09");
assert_eq!(timecode(75), "1:15");
assert_eq!(timecode(3661), "1:01:01");