input: Write a function to get unique values from a list of integers.
  assert get_unique_values([2, 3, 4, 4, 5, 6, 7, 7, 8, 8]) == [2, 3, 4, 5, 6, 7, 8]
  assert get_unique_values([1, 1, 2, 2, 3, 3, 4, 4]) == [1, 2, 3, 4]
  assert get_unique_values([5, 5, 5, 5, 5]) == [5]
output: def get_unique_values(lst):
      return list(set(lst))