input: Write a python function to return a sublist from the second to the third element of a given list.
  assert sublist([1, 2, 3, 4, 5]) == [2, 3]
  assert sublist([10, 20, 30, 40, 50]) == [20, 30]
  assert sublist(['a', 'b', 'c', 'd', 'e']) == ['b', 'c']
output: def sublist(lst):
      return lst[1:3]