code: func WriteBulk(b []byte, buf *goetty.ByteBuf) {
  	buf.WriteByte('$')
  	if len(b) == 0 {
  		buf.Write(NullBulk)
  	} else {
  		buf.Write(goetty.StringToSlice(strconv.Itoa(len(b))))
  		buf.Write(Delims)
  		buf.Write(b)
  	}
  
  	buf.Write(Delims)
  }
docs: // WriteBulk write bulk resp