old_contents: """
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program. If not, see <http://www.gnu.org/licenses/>.
  """
  
  
  class Printer:
      def _print(self, output, **kwargs):
          raise NotImplementedError
  
      def print(self, *args, delimiter=' ', end='\n', **kwargs):
          output = ""
          delim = ""
          for arg in args:
              output += delim + str(arg)
              delim = str(delimiter)
          output += str(end)
  
          return self._print(output, **kwargs)
  
new_contents: """
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program. If not, see <http://www.gnu.org/licenses/>.
  """
  
  
  class Printer:
      def _print(self, output, **kwargs):
          raise NotImplementedError
  
      def print(self, *args, delimiter=' ', end='\n', **kwargs):
          output = str(delimiter).join(str(arg) for arg in args) + str(end)
  
          return self._print(output, **kwargs)
  
subject: Simplify output concatenation