input: Write a python function to find common elements between two lists.
  assert find_common_elements([1, 2, 3, 4], [3, 4, 5, 6]) == [3, 4]
  assert find_common_elements([10, 20, 30], [30, 40, 50]) == [30]
  assert find_common_elements([1, 1, 2, 2], [2, 3, 4]) == [2]
  assert find_common_elements([5, 6, 7], [8, 9, 10]) == []
output: def find_common_elements(list1, list2):
      return list(set(list1) & set(list2))