refactor: Refactor error handling and variable declaration for better…

… code clarity.

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        goVer: [1.18.x]
+        goVer: ["1.20"]
 
     steps:
       - name: Set up Go ${{ matrix.goVer }}

notifier.go

@@ -18,8 +18,10 @@ func New(options ...Option) *Notifier {
 	return n
 }
 
-var ErrSendNotification = errors.New("send notification")
-var ErrNoProvider = errors.New("no provider, please check your config")
+var (
+	ErrSendNotification = errors.New("send notification")
+	ErrNoProvider       = errors.New("no provider, please check your config")
+)
 
 func (n *Notifier) Send(subject, content string) error {
 	if len(n.Providers) == 0 {
@@ -33,7 +35,6 @@ func (n *Notifier) Send(subject, content string) error {
 		})
 	}
 	err := eg.Wait()
-
 	if err != nil {
 		err = errors.Join(ErrSendNotification, err)
 	}

provider/serverchan/serverchan.go

@@ -23,9 +23,7 @@ func New(userID, sendKey string) *Provider {
 }
 
 func (p *Provider) Send(subject, content string) error {
-	var (
-		defaultServer = "sctapi.ftqq.com"
-	)
+	defaultServer := "sctapi.ftqq.com"
 	url := fmt.Sprintf("https://%s/%s.send", defaultServer, p.SendKey)
 	type postData struct {
 		Text string `json:"text"`