MAPG-235 refactored challenge token generation and check

src/Controller/GameController.php

@@ -112,11 +112,10 @@ class GameController implements ISecured
     public function createNewChallenge(): IContent
     {
         // create Challenge
-        $challengeToken = rand();
-        while ($this->challengeRepository->getByToken($challengeToken)) {
-            // if a challenge with the same token already exists
-            $challengeToken = rand();
-        }
+        do {
+            // initiliaze or if a challenge with the same token already exists
+            $challengeToken = mt_rand();
+        } while ($this->challengeRepository->getByToken($challengeToken));
 
         $challenge = new Challenge();
         $challenge->setToken($challengeToken);