input: Write a python function to find numbers in a given range that are divisible by 7 but not a multiple of 5.
  assert div_by_7_not_5(1, 100) == [7, 14, 21, 28, 42, 49, 56, 63, 77, 84, 91, 98]
  assert div_by_7_not_5(10, 50) == [14, 21, 28, 42, 49]
  assert div_by_7_not_5(200, 300) == [203, 217, 224, 231, 245, 259, 266, 273, 287, 294]
output: def div_by_7_not_5(start, end):
      return [num for num in range(start, end + 1) if num % 7 == 0 and num % 5 != 0]