input: Write a function to remove zeroes from a list.
  assert remove_zeroes([0, 1, 0, 3, 5, 0, 4]) == [1, 3, 5, 4]
  assert remove_zeroes([0, 0, 0, 0]) == []
  assert remove_zeroes([10, 0, 20, 0, 30]) == [10, 20, 30]
output: def remove_zeroes(lst):
      return [x for x in lst if x != 0]