diff --git a/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta2 b/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta2
index ebb12725..cd44dc76 100644
--- a/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta2
+++ b/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta2
@@ -205,7 +205,7 @@ tlsCipherSuites:
   - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
   - TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
 {{- end }}
-{{- if .kubernetes.kubelet.feature_gates | empty | not }} 
+{{- if .kubernetes.kubelet.feature_gates | empty | not }}
 featureGates:
 {{ .kubernetes.kubelet.feature_gates | toYaml | indent 2 }}
 {{- end }}
diff --git a/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta3 b/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta3
index b594d9d3..a873c823 100644
--- a/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta3
+++ b/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta3
@@ -204,7 +204,7 @@ tlsCipherSuites:
   - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
   - TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
 {{- end }}
-{{- if .kubernetes.kubelet.feature_gates | empty | not }} 
+{{- if .kubernetes.kubelet.feature_gates | empty | not }}
 featureGates:
 {{ .kubernetes.kubelet.feature_gates | toYaml | indent 2 }}
 {{- end }}
diff --git a/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta4 b/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta4
index 70a72dc3..3d0514bd 100644
--- a/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta4
+++ b/builtin/core/roles/kubernetes/init-kubernetes/templates/kubeadm/kubeadm-init.v1beta4
@@ -235,7 +235,7 @@ tlsCipherSuites:
   - TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
   - TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305
 {{- end }}
-{{- if .kubernetes.kubelet.feature_gates | empty | not }} 
+{{- if .kubernetes.kubelet.feature_gates | empty | not }}
 featureGates:
 {{ .kubernetes.kubelet.feature_gates | toYaml | indent 2 }}
 {{- end }}
diff --git a/pkg/converter/tmpl/functions.go b/pkg/converter/tmpl/functions.go
index e2c28c1b..767691bb 100644
--- a/pkg/converter/tmpl/functions.go
+++ b/pkg/converter/tmpl/functions.go
@@ -145,23 +145,19 @@ func getStringSlice(d map[string][]string, key string) []string {
 
 // kubeExtraArgs make kubeadm extra args of v1/beta4
 // for string/string extra argument maps, convert to structured extra arguments
-func kubeExtraArgs(input interface{}) []map[string]string {
-	result := []map[string]string{}
+func kubeExtraArgs(input any) []map[string]string {
 	v := reflect.ValueOf(input)
-	switch v.Kind() {
-	case reflect.Map:
-		iter := v.MapRange()
-		for iter.Next() {
-			key := iter.Key().String()
-			value := iter.Value()
-			var valueStr string
-			if value.CanInterface() {
-				valueStr = fmt.Sprintf("%v", value.Interface())
-			} else {
-				valueStr = value.String()
-			}
-			result = append(result, map[string]string{"name": key, "value": valueStr})
-		}
+	if v.Kind() != reflect.Map {
+		return []map[string]string{}
+	}
+
+	result := make([]map[string]string, 0, v.Len())
+	iter := v.MapRange()
+	for iter.Next() {
+		key := iter.Key().String()
+		value := iter.Value()
+		valueStr := fmt.Sprintf("%v", value.Interface())
+		result = append(result, map[string]string{"name": key, "value": valueStr})
 	}
 	return result
 }