input: Write a python function to remove a specific item from a list.
  assert remove_item(5, [8, 4, 5, 9, 2]) == [8, 4, 9, 2]
  assert remove_item(4, [8, 4, 5, 9, 2]) == [8, 5, 9, 2]
  assert remove_item(9, [8, 4, 5, 9, 2]) == [8, 4, 5, 2]
output: def remove_item(item, lst):
      return [x for x in lst if x != item]