input: Write a python function to find numbers divisible by 7 in a given range.
  assert find_divisible_by_7(15, 41) == [21, 28, 35]
  assert find_divisible_by_7(1, 50) == [7, 14, 21, 28, 35, 42, 49]
  assert find_divisible_by_7(20, 30) == [21, 28]
output: def find_divisible_by_7(start, end):
      return [num for num in range(start, end + 1) if num % 7 == 0]