input: Write a function to find the common elements between two given lists. If one of the lists is empty, return an empty list. If there are no common elements, return an empty list as well.
  def find_common_elements(list1, list2):
      common = [x for x in list1 if x in list2]
      return common
  
  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([], [4, 5, 6])==[]
  assert find_common_elements([], [])==[]
output: def find_common_elements(list1, list2):
      common = [x for x in list1 if x in list2]
      return common