code: def _clean_code(self, code):
          
          lines = code.split("\n")
          min_indent = 100
          for line in lines:
              if line.strip() != "":
                  indent = len(line) - len(line.lstrip())
                  min_indent = min(indent, min_indent)
          if min_indent > 0:
              lines = [line[min_indent:] for line in lines]
          code = "\n".join(lines)
          return code
docs: Return *code* with indentation and leading/trailing blank lines
          removed.