input: Write a function to print a task schedule within given working hours.
  assert print_schedule((9, 17), [("Task 1", 2), ("Task 2", 3), ("Task 3", 4)]) == None
  assert print_schedule((9, 17), [("Task 1", 2), ("Task 2", 3), ("Task 3", 7)]) == "Can not finish all tasks within given working hours"
  assert print_schedule((8, 12), [("Task 1", 2), ("Task 2", 1), ("Task 3", 2)]) == "Can not finish all tasks within given working hours"
output: def print_schedule(hours, tasks):
      start, end = hours
      current_time = start
      
      for task, duration in tasks:
          if current_time + duration > end:
              return "Can not finish all tasks within given working hours"
          current_time += duration
          print(f"{task}: {current_time - duration}:00 - {current_time}:00")
      return None