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Write a function. Test real cases. Improve your solution.
Turn a nonnegative whole number of seconds into a string in H:MM:SS format. Hours have no leading zero and may exceed 23. Minutes and seconds must each use two digits. For example, 61 becomes "0:01:01". The argument is always an integer, not a boolean.
[0]
"0:00:00"
[59]
"0:00:59"
[60]
"0:01:00"
[3601]
"1:00:01"
[90061]
"25:01:01"
[7325]
"2:02:05"
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