code: func ConnectDbg(addr string) (*FTP, error) {
  	var err error
  	var conn net.Conn
  
  	if conn, err = net.Dial("tcp", addr); err != nil {
  		return nil, err
  	}
  
  	writer := bufio.NewWriter(conn)
  	reader := bufio.NewReader(conn)
  
  	var line string
  
  	object := &FTP{conn: conn, addr: addr, reader: reader, writer: writer, debug: true}
  	line, _ = object.receive()
  
  	log.Print(line)
  
  	return object, nil
  }
docs: // ConnectDbg to server at addr (format "host:port"). debug is ON