input: Write a function to remove specified element from a list.
  assert remove_element([1, 2, 3, 4, 5], 3) == [1, 2, 4, 5]
  assert remove_element([10, 20, 30, 40, 50], 20) == [10, 30, 40, 50]
  assert remove_element([5, 5, 5, 5, 5], 5) == []
  assert remove_element([1, 2, 3, 4, 5], 6) == [1, 2, 3, 4, 5]
output: def remove_element(lst, element):
      return [x for x in lst if x != element]