add mock api for contratti

src/Api/Core/Request.php

@@ -18,8 +18,7 @@ class Request {
         return $_GET;
     }
 
-    public function header(string $name): ?string
-    {
+    public function header(string $name): ?string {
         $key = 'HTTP_' . strtoupper(str_replace('-', '_', $name));
         return $_SERVER[$key] ?? null;
     }