fix slug

kernel/helpers/Slug.php

@@ -127,6 +127,11 @@ class Slug
         return $options['lowercase'] ? mb_strtolower($str, 'UTF-8') : $str;
     }
 
+    /**
+     * @param string $title
+     * @param $model
+     * @return string
+     */
     public static function createSlug(string $title, $model = null): string
     {
         $slug = Slug::url_slug($title, ['transliterate' => true, 'lowercase' => true]);
@@ -137,7 +142,14 @@ class Slug
         return Slug::recursiveCreateSlug($model, $slug);
     }
 
-    protected static function recursiveCreateSlug($model, string $slug, string $tmpSlug = '', int $id = 1): string
+    /**
+     * @param $model
+     * @param string $slug
+     * @param string $tmpSlug
+     * @param int $id
+     * @return string
+     */
+    private static function recursiveCreateSlug($model, string $slug, string $tmpSlug = '', int $id = 1): string
     {
         if ($tmpSlug === '') $tmpSlug = $slug;
         if ($model::where(['slug' => $tmpSlug])->exists()) {