diff --git a/internal/nodes/node_tasks.go b/internal/nodes/node_tasks.go
index 2fdfab5..09c13ed 100644
--- a/internal/nodes/node_tasks.go
+++ b/internal/nodes/node_tasks.go
@@ -17,6 +17,7 @@ import (
 	"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
 	"github.com/TeaOSLab/EdgeNode/internal/rpc"
 	"github.com/TeaOSLab/EdgeNode/internal/trackers"
+	"github.com/TeaOSLab/EdgeNode/internal/utils"
 	"github.com/TeaOSLab/EdgeNode/internal/waf"
 	"github.com/iwind/TeaGo/Tea"
 	"github.com/iwind/TeaGo/maps"
@@ -298,7 +299,7 @@ func (this *Node) execUpdatingServersTask(rpcClient *rpc.RPCClient) error {
 
 // 删除IP名单
 func (this *Node) execDeleteIPList(taskType string) error {
-	optionsString, ok := strings.CutPrefix(taskType, "ipListDeleted@")
+	optionsString, ok := utils.CutPrefix(taskType, "ipListDeleted@")
 	if !ok {
 		return errors.New("invalid task type '" + taskType + "'")
 	}
diff --git a/internal/utils/string.go b/internal/utils/string.go
index dc3745c..4026a98 100644
--- a/internal/utils/string.go
+++ b/internal/utils/string.go
@@ -56,3 +56,16 @@ func EqualStrings(s1 []string, s2 []string) bool {
 	}
 	return true
 }
+
+// CutPrefix returns s without the provided leading prefix string
+// and reports whether it found the prefix.
+// If s doesn't start with prefix, CutPrefix returns s, false.
+// If prefix is the empty string, CutPrefix returns s, true.
+//
+// copy from go source
+func CutPrefix(s, prefix string) (after string, found bool) {
+	if !strings.HasPrefix(s, prefix) {
+		return s, false
+	}
+	return s[len(prefix):], true
+}