code: def prepare(self, inputstring, strip=False, nl_at_eof_check=False, **kwargs):
          
          if self.strict and nl_at_eof_check and inputstring and not inputstring.endswith("\n"):
              end_index = len(inputstring) - 1 if inputstring else 0
              raise self.make_err(CoconutStyleError, "missing new line at end of file", inputstring, end_index)
          original_lines = inputstring.splitlines()
          if self.keep_lines:
              self.original_lines = original_lines
          inputstring = "\n".join(original_lines)
          if strip:
              inputstring = inputstring.strip()
          return inputstring
docs: Prepare a string for processing.