diff --git a/client/http_api.go b/client/http_api.go
index 35ae0b63..98a18afb 100644
--- a/client/http_api.go
+++ b/client/http_api.go
@@ -5,7 +5,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"html"
-	"io"
 	"mime/multipart"
 	"net/http"
 	"net/textproto"
@@ -158,7 +157,6 @@ type noticeImage struct {
 }
 
 func (c *QQClient) GetGroupNotice(groupCode int64) (l []*GroupNoticeMessage, err error) {
-
 	v := url.Values{}
 	v.Set("bkn", strconv.Itoa(c.getCSRFToken()))
 	v.Set("qid", strconv.FormatInt(groupCode, 10))
@@ -220,33 +218,15 @@ func (c *QQClient) parseGroupNoticeJson(s *groupNoticeRsp) []*GroupNoticeMessage
 func (c *QQClient) uploadGroupNoticePic(img []byte) (*noticeImage, error) {
 	buf := new(bytes.Buffer)
 	w := multipart.NewWriter(buf)
-	err := w.WriteField("bkn", strconv.Itoa(c.getCSRFToken()))
-	if err != nil {
-		return nil, errors.Wrap(err, "write multipart<bkn> failed")
-	}
-	err = w.WriteField("source", "troopNotice")
-	if err != nil {
-		return nil, errors.Wrap(err, "write multipart<source> failed")
-	}
-	err = w.WriteField("m", "0")
-	if err != nil {
-		return nil, errors.Wrap(err, "write multipart<m> failed")
-	}
+	_ = w.WriteField("bkn", strconv.Itoa(c.getCSRFToken()))
+	_ = w.WriteField("source", "troopNotice")
+	_ = w.WriteField("m", "0")
 	h := make(textproto.MIMEHeader)
 	h.Set("Content-Disposition", `form-data; name="pic_up"; filename="temp_uploadFile.png"`)
 	h.Set("Content-Type", "image/png")
-	fw, err := w.CreatePart(h)
-	if err != nil {
-		return nil, errors.Wrap(err, "create multipart field<pic_up> failed")
-	}
-	_, err = fw.Write(img)
-	if err != nil {
-		return nil, errors.Wrap(err, "write multipart<pic_up> failed")
-	}
-	err = w.Close()
-	if err != nil {
-		return nil, errors.Wrap(err, "close multipart failed")
-	}
+	fw, _ := w.CreatePart(h)
+	_, _ = fw.Write(img)
+	_ = w.Close()
 	req, err := http.NewRequest("POST", "https://web.qun.qq.com/cgi-bin/announce/upload_img", buf)
 	if err != nil {
 		return nil, errors.Wrap(err, "new request error")
@@ -258,12 +238,8 @@ func (c *QQClient) uploadGroupNoticePic(img []byte) (*noticeImage, error) {
 		return nil, errors.Wrap(err, "post error")
 	}
 	defer resp.Body.Close()
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, errors.Wrap(err, "read body error")
-	}
-	res := noticePicUpResponse{}
-	err = json.Unmarshal(body, &res)
+	var res noticePicUpResponse
+	err = json.NewDecoder(resp.Body).Decode(&res)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal json")
 	}
diff --git a/client/image.go b/client/image.go
index d0d97186..a4e2a3eb 100644
--- a/client/image.go
+++ b/client/image.go
@@ -329,7 +329,6 @@ func (c *QQClient) uploadOcrImage(img io.Reader, size int32, sum []byte) (string
 		Sum:       sum,
 		Ticket:    c.highwaySession.SigSession,
 		Ext:       ext,
-		Encrypt:   false,
 	})
 	if err != nil {
 		return "", errors.Wrap(err, "upload ocr image error")
diff --git a/client/private_msg.go b/client/private_msg.go
index 13afd518..a899089f 100644
--- a/client/private_msg.go
+++ b/client/private_msg.go
@@ -192,7 +192,6 @@ func (c *QQClient) buildGroupTempSendingPacket(groupUin, target int64, msgSeq, r
 }
 
 func (c *QQClient) buildWPATempSendingPacket(uin int64, sig []byte, msgSeq, r int32, time int64, m *message.SendingMessage) (uint16, []byte) {
-
 	req := &msg.SendMessageRequest{
 		RoutingHead: &msg.RoutingHead{WpaTmp: &msg.WPATmp{
 			ToUin: proto.Uint64(uint64(uin)),
diff --git a/client/ptt.go b/client/ptt.go
index f53e5ac8..7ed1ea93 100644
--- a/client/ptt.go
+++ b/client/ptt.go
@@ -79,7 +79,6 @@ func (c *QQClient) UploadVoice(target message.Source, voice io.ReadSeeker) (*mes
 		Size:      length,
 		Ticket:    c.highwaySession.SigSession,
 		Ext:       ext,
-		Encrypt:   false,
 	})
 	if err != nil {
 		return nil, err
diff --git a/message/elements.go b/message/elements.go
index c1d02ee0..c90e6015 100644
--- a/message/elements.go
+++ b/message/elements.go
@@ -103,8 +103,10 @@ type AnimatedSticker struct {
 	Name string
 }
 
-type RedBagMessageType int
-type AtType int
+type (
+	RedBagMessageType int
+	AtType            int
+)
 
 // /com/tencent/mobileqq/data/MessageForQQWalletMsg.java
 const (
diff --git a/message/message.go b/message/message.go
index 201fd169..2cb9673b 100644
--- a/message/message.go
+++ b/message/message.go
@@ -778,7 +778,7 @@ func splitPlainMessage(content string) []IMessageElement {
 		}
 	}
 	if last != len(content) {
-		splittedMessage = append(splittedMessage, NewText(content[last:len(content)]))
+		splittedMessage = append(splittedMessage, NewText(content[last:]))
 	}
 
 	return splittedMessage