Convert Timecode to Seconds

Problem

Given a string timecode representing time in the format "hh:mm:ss", return the total number of seconds represented by the timecode.

The timecode input will always be valid.

Examples

timecodeToSeconds("00:01:00")
// 60
timecodeToSeconds("01:01:00")
// 3660
timecodeToSeconds("02:30:15")
// 9015