Write a function, which takes a non-negative integer (seconds) as input and returns the time in a human-readable format (`HH:MM:SS`)
* `HH` = hours, padded to 2 digits, range: 00 - 99
* `MM` = minutes, padded to 2 digits, range: 00 - 59
* `SS` = seconds, padded to 2 digits, range: 00 - 59
The maximum time never exceeds 359999 (`99:59:59`)
You can find some examples in the test fixtures.
def make_readable(n):
    return f'{n//3600:02d}:{(n%3600)//60:02d}:{n%60:02d}'

def make_readable(n):
    return f'{n//3600:02d}:{(n%3600)//60:02d}:{n%60:02d}'
