Write a function add1sec(h,m,s) that receives as argument a clock time, given in hours, minutes and seconds, and returns, again in hours, minutes and seconds, the clock time increased by one second. The arguments received fulfill the preconditions h<24, m<60 and s<60, and the resulting clock time must obey the same inequalities.
>>> add1sec(0, 1, 2) (0, 1, 3) >>> add1sec(3, 5, 9) (3, 5, 10) >>> add1sec(19, 45, 59) (19, 46, 0) >>> add1sec(12, 59, 59) (13, 0, 0)