Fix

composer.json

@@ -12,7 +12,7 @@
     },
     "autoload": {
         "psr-4": {
-            "Krutush\\Template": "src/"
+            "Krutush\\Template\\": "src/"
         }
     }
 }

src/Html.php

@@ -4,6 +4,9 @@ namespace Krutush\Template;
 
 class Html extends Text{
 
+    /** @var string */
+    const EXTENTION = '.phtml';
+
     public function _escape(string $data){
         return htmlspecialchars($data, ENT_QUOTES, 'UTF-8');
     }

src/Template.php

@@ -10,7 +10,7 @@ class Template{
     /** @var array */
     private $data = array();
     /** @var string */
-    private $extention = '.tpl';
+    const EXTENTION = '.tpl';
 
     public function __construct(string $path, string $extention = null, bool $folder = true){
         $this->path = $this->path($path, $extention, $folder);
@@ -77,7 +77,7 @@ class Template{
     }
 
     public function path(string $path, string $extention = null, bool $folder = true): string{
-        $path .= $extention ?? $this->extention;
+        $path .= $extention ?? self::EXTENTION;
         if($folder == true && class_exists(\Krutush\Path)) //Remove require krutush/krutush
             $path = \Krutush\Path::get('template').'/'.$path;