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.
  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, 1, 1], [1, 1, 2]) == [1, 1]
output: def find_common_elements(list1, list2):
      return [item for item in list1 if item in list2]