input: Write a python function to find common elements between two lists.
  assert find_common_elements([1, 2, 3, 4, 5], [2, 4, 6, 8]) == [2, 4]
  assert find_common_elements([10, 20, 30], [30, 40, 50]) == [30]
  assert find_common_elements([1, 3, 5], [2, 4, 6]) == []
output: def find_common_elements(list1, list2):
      return list(set(list1) & set(list2))