input: Write a python function to find the intersection of two lists.
  assert intersection([1, 2, 3, 4, 5, 6], [3, 6, 7, 8, 9, 10]) == [3, 6]
  assert intersection([10, 20, 30, 40], [15, 25, 35, 45]) == []
  assert intersection([7, 8, 9, 10], [5, 6, 7, 8]) == [8, 7]
output: def intersection(list1, list2):
      return list(set(list1) & set(list2))