code: func loadConfig(configFile string) ([][]string, error) {
  	f, err := os.Open(configFile)
  	if err != nil {
  		return nil, err
  	}
  	defer f.Close()
  
  	var config [][]string
  	if err := json.NewDecoder(f).Decode(&config); err != nil {
  		return nil, err
  	}
  	return config, nil
  }
docs: // loadConfig handles loading specified configuration file and returning it.