input: Write a python function to get distinct elements from a list.
  assert get_distinct_elements([1, 2, 2, 3, 4, 4, 5]) == [1, 2, 3, 4, 5]
  assert get_distinct_elements([10, 10, 10, 20, 30, 30]) == [10, 20, 30]
  assert get_distinct_elements([5, 6, 7, 8, 9, 9, 9]) == [5, 6, 7, 8, 9]
output: def get_distinct_elements(lst):
      return list(set(lst))