code: def shift_time(start_time, mins) -> str:
      
      s_time = pd.Timestamp(start_time)
      e_time = s_time + np.sign(mins) * pd.Timedelta(f'00:{abs(mins)}:00')
      return e_time.strftime('%H:%M')
docs: Shift start time by mins
  
      Args:
          start_time: start time in terms of HH:MM string
          mins: number of minutes (+ / -)
  
      Returns:
          end time in terms of HH:MM string