diff --git a/exam/api/index.php b/exam/api/index.php
index 48d4cf4..641ba97 100644
--- a/exam/api/index.php
+++ b/exam/api/index.php
@@ -16,7 +16,7 @@ use Pecee\SimpleRouter\Handlers\EventHandler;
 use Pecee\SimpleRouter\Event\EventArgument;
 use Pecee\SimpleRouter\Route\ILoadableRoute;
 use Pecee\SimpleRouter\Route\IGroupRoute;
-use Config\Config;
+use Khofmann\Config\Config;
 // Router base path
 $basePath = Config::getBasePath() . "api";
 // Router event handler for prepending base path
diff --git a/exam/config/Config.php b/exam/classes/Config/Config.php
similarity index 73%
rename from exam/config/Config.php
rename to exam/classes/Config/Config.php
index 2d866e2..544c280 100644
--- a/exam/config/Config.php
+++ b/exam/classes/Config/Config.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Config;
+namespace Khofmann\Config;
 
 use Exception;
 
@@ -11,17 +11,18 @@ class Config
   private array $app;
   private array $database;
 
-  protected function __construct()
+  private function __construct()
   {
-    $this->app = require_once __DIR__ . "/app.php";
-    $this->database = require_once __DIR__ . "/database.php";
+    $this->app = require_once __DIR__ . "/../../config/app.php";
+    $this->database = require_once __DIR__ . "/../../config/database.php";
   }
 
-  protected function __clone()
+  private function __clone()
   {
+    throw new Exception("Cannot clone a singleton.");
   }
 
-  public function __wakeup()
+  private function __wakeup()
   {
     throw new Exception("Cannot unserialize a singleton.");
   }
diff --git a/exam/classes/Database/Database.php b/exam/classes/Database/Database.php
index 714ee92..31b88c8 100644
--- a/exam/classes/Database/Database.php
+++ b/exam/classes/Database/Database.php
@@ -3,17 +3,28 @@
 namespace Khofmann\Database;
 
 use PDO;
-use Config\Config;
+use Khofmann\Config\Config;
+use Exception;
 
 class Database extends PDO
 {
   private static array $instances = [];
 
-  protected function __construct(string $dsn, string $username = null, string $password = null, array $options = null)
+  private function __construct(string $dsn, string $username = null, string $password = null, array $options = null)
   {
     parent::__construct($dsn, $username, $password, $options);
   }
 
+  private function __clone()
+  {
+    throw new Exception("Cannot clone a singleton.");
+  }
+
+  private function __wakeup()
+  {
+    throw new Exception("Cannot unserialize a singleton.");
+  }
+
   public static function getInstance(): Database
   {
     $cls = static::class;
diff --git a/exam/classes/GUID/GUID.php b/exam/classes/GUID/GUID.php
index c1df4af..8d42287 100644
--- a/exam/classes/GUID/GUID.php
+++ b/exam/classes/GUID/GUID.php
@@ -4,6 +4,10 @@ namespace Khofmann\GUID;
 
 class GUID
 {
+  private function __construct()
+  {
+  }
+
   public static function v4($data = null): string
   {
     // Generate 16 bytes (128 bits) of random data or use the data passed into the function.
diff --git a/exam/classes/Input/Input.php b/exam/classes/Input/Input.php
index 29236f3..7e57e43 100644
--- a/exam/classes/Input/Input.php
+++ b/exam/classes/Input/Input.php
@@ -6,6 +6,10 @@ use Khofmann\Request\Request;
 
 class Input
 {
+  private function __construct()
+  {
+  }
+
   public static function post(string $index, $defaultValue = null)
   {
     $value = Request::request()->getInputHandler()->post($index, $defaultValue);
diff --git a/exam/classes/Models/Post/Post.php b/exam/classes/Models/Post/Post.php
index 5f1a9e5..9e4525e 100644
--- a/exam/classes/Models/Post/Post.php
+++ b/exam/classes/Models/Post/Post.php
@@ -21,7 +21,7 @@ class Post implements JsonSerializable
   private string $content;
   private DateTime $postedAt;
 
-  public function __construct(int $id, ?User $user, ?string $name, string $content, string $postedAt)
+  private function __construct(int $id, ?User $user, ?string $name, string $content, string $postedAt)
   {
     $this->id = $id;
     $this->user = $user;
diff --git a/exam/classes/Models/User/User.php b/exam/classes/Models/User/User.php
index 220bb22..1f038ad 100644
--- a/exam/classes/Models/User/User.php
+++ b/exam/classes/Models/User/User.php
@@ -6,7 +6,7 @@ use Exception;
 use PDO;
 use DateTime;
 use Khofmann\Database\Database;
-use Config\Config;
+use Khofmann\Config\Config;
 use JsonSerializable;
 use Khofmann\ApiError\ApiError;
 use Khofmann\GUID\GUID;
@@ -23,7 +23,7 @@ class User implements JsonSerializable
   private DateTime $memberSince;
   private int $postCount;
 
-  protected function __construct(int $id, string $username, int $status, string $email, string $timestamp, ?string $image, bool $isAdmin, int $postCount)
+  private function __construct(int $id, string $username, int $status, string $email, string $timestamp, ?string $image, bool $isAdmin, int $postCount)
   {
     $this->id = $id;
     $this->username = $username;
diff --git a/exam/classes/Request/Request.php b/exam/classes/Request/Request.php
index f018e02..78ccc0e 100644
--- a/exam/classes/Request/Request.php
+++ b/exam/classes/Request/Request.php
@@ -7,6 +7,10 @@ use Pecee\SimpleRouter\SimpleRouter;
 
 class Request
 {
+  private function __construct()
+  {
+  }
+
   public static function request(): PRequest
   {
     return SimpleRouter::request();
diff --git a/exam/classes/Response/Response.php b/exam/classes/Response/Response.php
index 8093953..ec26bc8 100644
--- a/exam/classes/Response/Response.php
+++ b/exam/classes/Response/Response.php
@@ -7,6 +7,10 @@ use Pecee\Http\Response as PResponse;
 
 class Response
 {
+  private function __construct()
+  {
+  }
+
   public static function response(): PResponse
   {
     return SimpleRouter::response();