input: Write a function to find the common elements between two given lists. The function should return a list of common elements. If there are no common elements, return an empty list.
  assert find_common_elements([1, 2, 3], [2, 3, 4]) == [2, 3]
  assert find_common_elements([1, 2, 3], [4, 5, 6]) == []
  assert find_common_elements([], [4, 5, 6]) == []
  assert find_common_elements([1, 2, 3], []) == []
  assert find_common_elements([], []) == []
output: def find_common_elements(list1, list2):
      return list(set(list1) & set(list2))