Fix lint errors

route/rule/rule_item_domain.go

@@ -1,6 +1,7 @@
 package rule
 
 import (
+	"slices"
 	"strings"
 
 	"github.com/sagernet/sing-box/adapter"
@@ -16,15 +17,11 @@ type DomainItem struct {
 }
 
 func NewDomainItem(domains []string, domainSuffixes []string) (*DomainItem, error) {
-	for _, domainItem := range domains {
-		if domainItem == "" {
-			return nil, E.New("domain: empty item is not allowed")
-		}
+	if slices.Contains(domains, "") {
+		return nil, E.New("domain: empty item is not allowed")
 	}
-	for _, domainSuffixItem := range domainSuffixes {
-		if domainSuffixItem == "" {
-			return nil, E.New("domain_suffix: empty item is not allowed")
-		}
+	if slices.Contains(domainSuffixes, "") {
+		return nil, E.New("domain_suffix: empty item is not allowed")
 	}
 	var description string
 	if dLen := len(domains); dLen > 0 {