input: Write a function to remove all occurrences of a specified item from a given list. The function should return the modified list. If the list is empty or the item is not found, the function should return the original list.
  assert removeItem([1, 2, 3, 4, 2, 5, 2], 2)==[1, 3, 4, 5]
  assert removeItem([1, 2, 2, 2, 3], 2)==[1, 3]
  assert removeItem([], 2)==[]
  assert removeItem([1, 3, 4, 5], 2)==[1, 3, 4, 5]
  assert removeItem([2, 2, 2, 2], 2)==[]
  assert removeItem([1, 2, 3, 4, 2, 5, 2], 6)==[1, 2, 3, 4, 2, 5, 2]
output: def removeItem(lst, item):
      return [x for x in lst if x != item]