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([4, 5, 6], [7, 8, 9])==[]
  assert find_common_elements([1, 2, 3, 4, 5], [5, 4, 3])==[3, 4, 5]
  assert find_common_elements([], [1, 2, 3])==[]
  assert find_common_elements([1, 1, 1], [1, 1])==[1, 1]
output: def find_common_elements(list1, list2):
      return list(set(list1) & set(list2))