code: def _extract_input_processes(self):
      
      for proc in self.processes:
        ends = proc.split('/')
        pid, name = self._get_tuple(ends)
        self.input_processes.append((pid, name))
docs: Given user input of interested processes, it will extract the info and output a list of tuples.
      - input can be multiple values, separated by space;
      - either pid or process_name is optional
      - e.g., "10001/python 10002/java cpp"
      :return: None