input: Write a python function to copy elements from one list to another.
  assert copy_elements([1, 2, 3, 4, 5]) == [1, 2, 3, 4, 5]
  assert copy_elements(['a', 'b', 'c']) == ['a', 'b', 'c']
  assert copy_elements([]) == []
output: def copy_elements(lst):
      return lst[:]