input: Write a function to find the common elements between two given lists. The function should return a list of elements that are present in both input lists. If no common elements are found, it should return an empty list. If either list is empty, it should return an empty list as well.
  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([], [1, 2, 3])==[]
  assert find_common_elements([1, 2, 3], [])==[]
output: def find_common_elements(list1, list2):
      if not list1 or not list2:
          return []
      return list(set(list1) & set(list2))