input: Write a function to check if a number is divisible by both 3 and 5.
  assert divisible_by_three_and_five(15) == True
  assert divisible_by_three_and_five(30) == True
  assert divisible_by_three_and_five(10) == False
  assert divisible_by_three_and_five(9) == False
output: def divisible_by_three_and_five(number):
      return number % 3 == 0 and number % 5 == 0