refactor: simplify structure

Makefile

@@ -17,4 +17,7 @@ brain-games:
 	./bin/brain-games
 
 brain-even:
-	./bin/brain-even
+	./bin/brain-even
+
+brain-calc:
+	./bin/brain-calc

composer.json

@@ -9,7 +9,6 @@
     "files": [
       "src/Engine.php",
       "src/Cli.php",
-      "src/Games/EvenGame/Module.php",
       "src/Utils/ConfigUtils.php",
       "src/Utils/ModuleUtils.php"
     ]
@@ -25,7 +24,8 @@
   },
   "bin": [
     "bin/brain-games",
-    "bin/brain-even"
+    "bin/brain-even",
+    "bin/brain-calc"
   ],
   "license": "MIT",
   "require-dev": {

src/Engine.php

@@ -4,14 +4,14 @@
 
 use RuntimeException;
 
-use function BrainGames\ConfigUtils\loadConfigurations;
-use function BrainGames\ConfigUtils\loadModule;
-use function BrainGames\ModuleUtils\getQuestionAnswerPairHandler;
-use function BrainGames\ModuleUtils\getRulesDescription;
-use function BrainGames\ModuleUtils\getText;
-use function BrainGames\ModuleUtils\getUserName;
-use function BrainGames\ModuleUtils\setTexts;
-use function BrainGames\ModuleUtils\setUserName;
+use function BrainGames\Utils\ConfigUtils\loadConfigurations;
+use function BrainGames\Utils\ConfigUtils\loadModule;
+use function BrainGames\Utils\ModuleUtils\getQuestionAnswerPairHandler;
+use function BrainGames\Utils\ModuleUtils\getRulesDescription;
+use function BrainGames\Utils\ModuleUtils\getText;
+use function BrainGames\Utils\ModuleUtils\getUserName;
+use function BrainGames\Utils\ModuleUtils\setTexts;
+use function BrainGames\Utils\ModuleUtils\setUserName;
 use function cli\line;
 use function cli\prompt;
 
@@ -26,7 +26,7 @@ function runBrainGame(string $moduleName): void
 
 function loadGame($moduleName): array
 {
-    $moduleFile = __DIR__ . '/Games/' . $moduleName . '/config.php';
+    $moduleFile = __DIR__ . '/Games/' . $moduleName . '.php';
     if (!file_exists($moduleFile)) {
         throw new RuntimeException("Module $moduleFile not found");
     }

src/Games/EvenGame.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace BrainGames\Games\EvenGame;
+
+use Exception;
+
+use const BrainGames\Utils\ModuleUtils\HANDLER_QUESTION;
+use const BrainGames\Utils\ModuleUtils\LOCATION_HANDLERS;
+use const BrainGames\Utils\ModuleUtils\LOCATION_SETTINGS;
+use const BrainGames\Utils\ModuleUtils\SETTING_RULES;
+
+return function ($module) {
+    $module[LOCATION_SETTINGS][SETTING_RULES] = 'Answer "yes" if the number is even, otherwise answer "no".';
+
+    $module[LOCATION_HANDLERS][HANDLER_QUESTION] = fn() => questionHandler();
+
+    return $module;
+};
+
+/**
+ * Returns a question and its expected answer.
+ *
+ * - 0: The question (string)
+ * - 1: The expected answer (string)
+ *
+ * @return array{
+ *     0: string,
+ *     1: string
+ * }
+ * @throws Exception
+ */
+function questionHandler(): array
+{
+    $question = random_int(1, 100);
+    $isEven = $question % 2 === 0;
+    return [$question, $isEven ? 'yes' : 'no'];
+}

src/Utils/ConfigUtils.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace BrainGames\ConfigUtils;
+namespace BrainGames\Utils\ConfigUtils;
 
 function loadConfigurations($configFile): array
 {

src/Utils/ModuleUtils.php

@@ -1,14 +1,14 @@
 <?php
 
-namespace BrainGames\ModuleUtils;
+namespace BrainGames\Utils\ModuleUtils;
 
 const DATA_USER_NAME = 3010;
 const HANDLER_QUESTION = 100;
 const LOCATION_DATA = 'data';
 const LOCATION_HANDLERS = 'handlers';
 const LOCATION_SETTINGS = 'settings';
 const LOCATION_TEXTS = 'texts';
-const SETTING_RULES_DESCRIPTION = 103;
+const SETTING_RULES = 103;
 
 /**
  * Returns a question and its expected answer.
@@ -26,21 +26,9 @@ function getQuestionAnswerPairHandler($module): array
     return $module[LOCATION_HANDLERS][HANDLER_QUESTION]();
 }
 
-function setQuestionAnswerPairHandler($module, callable $handler): array
-{
-    $module[LOCATION_HANDLERS][HANDLER_QUESTION] = $handler;
-    return $module;
-}
-
-function setRulesDescription($module, $rulesDescription): array
-{
-    $module[LOCATION_SETTINGS][SETTING_RULES_DESCRIPTION] = $rulesDescription;
-    return $module;
-}
-
 function getRulesDescription($module): string
 {
-    return $module[LOCATION_SETTINGS][SETTING_RULES_DESCRIPTION];
+    return $module[LOCATION_SETTINGS][SETTING_RULES];
 }
 
 function getText($module, $key, $replace_pairs = []): string