old_contents: class PythonSkeleton:
      @staticmethod
      def run():
          PythonSkeleton.hello()
  
          return 0
  
      @staticmethod
      def hello():
          print('Hello Friend.')
  
new_contents: class PythonSkeleton:
      @staticmethod
      def run():
          PythonSkeleton.hello()
  
          return 0
  
      @staticmethod
      def hello():
          print('Hello friend.')
  
subject: fix typo