input: Write a python function to calculate the duration of each job in days.
  assert job_durations(timeline) == {"Job A": 17, "Job B": 57, "Job C": 26}
output: def job_durations(timeline):
      durations = {}
      for job, (start, end) in timeline.items():
          start_date = datetime.strptime(start, "%d-%m-%Y")
          end_date = datetime.strptime(end, "%d-%m-%Y")
          duration = (end_date - start_date).days
          durations[job] = duration
      return durations