intialize attributes on Core's class constructor

mvc/app/libs/Core.php

@@ -10,11 +10,15 @@
     */
 
     class Core{
-        protected $defaultController = (ucwords('welcome'));
-        protected $defaultMethod = 'index';
-        protected $defaultParams = [];
+        protected $defaultController;
+        protected $defaultMethod;
+        protected $defaultParams;
 
         public function __construct(){
+            $this->defaultController = ucwords('welcome');
+            $this->defaultMethod = 'index';
+            $this->defaultParams = [];
+            
             // print_r($this->getURL());
             $url = $this->getURL();