input: Write a python function to compute the number of days between two dates.
  assert compute_days_between_dates("2020/05/20", "2020/05/21") == 1
  assert compute_days_between_dates("2020/01/01", "2020/01/31") == 30
  assert compute_days_between_dates("2019/12/31", "2020/01/01") == 1
output: def compute_days_between_dates(date1, date2):
      from datetime import datetime
  
      date_format = "%Y/%m/%d"
      d1 = datetime.strptime(date1, date_format)
      d2 = datetime.strptime(date2, date_format)
      
      delta = d2 - d1
      return delta.days