input: Write a python function to calculate the volume of a room given its length, width, and height.
  assert calculate_room_volume(5, 8, 3) == 120
  assert calculate_room_volume(10, 15, 2) == 300
  assert calculate_room_volume(7, 9, 4) == 252
output: def calculate_room_volume(length, width, height):
      return length * width * height