input: Write a function that takes two lists as input and returns a list of elements that are common between both lists. If there is no common element, the function should return an empty list.
  
  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, 3, 5], [2, 4, 6]) == []
  assert find_common_elements([1, 2, 3, 4], [3, 4, 5, 6]) == [3, 4]
  assert find_common_elements([], [1, 2, 3]) == []
  assert find_common_elements([1, 2], []) == []
output: def find_common_elements(list1, list2):
      common = [x for x in list1 if x in list2]
      return common