input: Write a function to clean temperature readings by removing leading/trailing spaces and converting them to integers.
  assert clean_temps([' 24 ', ' 31', '15 ', ' 21 ']) == [24, 31, 15, 21]
  assert clean_temps([' 10 ', ' 20', '30 ', ' 40 ']) == [10, 20, 30, 40]
  assert clean_temps([' 5', '  6 ', ' 7', '8']) == [5, 6, 7, 8]
output: def clean_temps(temp_list):
      return [int(temp.strip()) for temp in temp_list]