input: Write a function to find common elements between two lists.
  assert find_common_elements([2, 4, 6, 8], [4, 8, 10]) == [4, 8]
  assert find_common_elements([1, 3, 5], [2, 4, 6]) == []
  assert find_common_elements([7, 9, 11], [5, 7, 9, 11]) == [7, 9, 11]
output: def find_common_elements(list1, list2):
      return list(set(list1) & set(list2))