input: Write a function to remove all occurrences of a specified item from a given list. If the list is empty, return an empty list.
  assert removeItem([1, 2, 3, 4, 2, 5, 2], 2)==[1, 3, 4, 5]
  assert removeItem([], 2)==[]
  assert removeItem([5, 5, 5, 5], 5)==[]
  assert removeItem([1, 2, 3, 4], 5)==[1, 2, 3, 4]
output: def removeItem(lst, item):
      return [x for x in lst if x != item]