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(['a', 'b', 'c'], ['b', 'c', 'd']) == ['b', 'c']
  assert find_common_elements([10, 20, 30], [40, 50, 60]) == []
output: def find_common_elements(list1, list2):
      return list(set(list1) & set(list2))