code: def _detect(self):
          
          results = []
          for c in self.contracts:
              functions = IncorrectERC20InterfaceDetection.detect_incorrect_erc20_interface(c)
              if functions:
                  info = "{} ({}) has incorrect ERC20 function interface(s):\n"
                  info = info.format(c.name,
                                     c.source_mapping_str)
                  for function in functions:
                      info += "\t-{} ({})\n".format(function.name, function.source_mapping_str)
                  json = self.generate_json_result(info)
                  self.add_functions_to_json(functions, json)
                  results.append(json)
  
          return results
docs: Detect incorrect erc20 interface
  
          Returns:
              dict: [contrat name] = set(str)  events