refactoring: Sonar CRITICAL issue fixes (iluwatar#2176)

Author: harshalkhachane

special-case/src/main/java/com/iluwatar/specialcase/App.java

@@ -37,35 +37,42 @@ public class App {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
 
+  private static final String LOGGER_STRING = "[REQUEST] User: {} buy product: {}";
+  private static final String TEST_USER_1 = "ignite1771";
+  private static final String TEST_USER_2 = "abc123";
+  private static final String ITEM_TV = "tv";
+  private static final String ITEM_CAR = "car";
+  private static final String ITEM_COMPUTER = "computer";
+
   /**
    * Program entry point.
    */
   public static void main(String[] args) {
     // DB seeding
     LOGGER.info("Db seeding: " + "1 user: {\"ignite1771\", amount = 1000.0}, "
         + "2 products: {\"computer\": price = 800.0, \"car\": price = 20000.0}");
-    Db.getInstance().seedUser("ignite1771", 1000.0);
-    Db.getInstance().seedItem("computer", 800.0);
-    Db.getInstance().seedItem("car", 20000.0);
+    Db.getInstance().seedUser(TEST_USER_1, 1000.0);
+    Db.getInstance().seedItem(ITEM_COMPUTER, 800.0);
+    Db.getInstance().seedItem(ITEM_CAR, 20000.0);
 
     final var applicationServices = new ApplicationServicesImpl();
     ReceiptViewModel receipt;
 
-    LOGGER.info("[REQUEST] User: " + "abc123" + " buy product: " + "tv");
-    receipt = applicationServices.loggedInUserPurchase("abc123", "tv");
+    LOGGER.info(LOGGER_STRING, TEST_USER_2, ITEM_TV);
+    receipt = applicationServices.loggedInUserPurchase(TEST_USER_2, ITEM_TV);
     receipt.show();
     MaintenanceLock.getInstance().setLock(false);
-    LOGGER.info("[REQUEST] User: " + "abc123" + " buy product: " + "tv");
-    receipt = applicationServices.loggedInUserPurchase("abc123", "tv");
+    LOGGER.info(LOGGER_STRING, TEST_USER_2, ITEM_TV);
+    receipt = applicationServices.loggedInUserPurchase(TEST_USER_2, ITEM_TV);
     receipt.show();
-    LOGGER.info("[REQUEST] User: " + "ignite1771" + " buy product: " + "tv");
-    receipt = applicationServices.loggedInUserPurchase("ignite1771", "tv");
+    LOGGER.info(LOGGER_STRING, TEST_USER_1, ITEM_TV);
+    receipt = applicationServices.loggedInUserPurchase(TEST_USER_1, ITEM_TV);
     receipt.show();
-    LOGGER.info("[REQUEST] User: " + "ignite1771" + " buy product: " + "car");
-    receipt = applicationServices.loggedInUserPurchase("ignite1771", "car");
+    LOGGER.info(LOGGER_STRING, TEST_USER_1, ITEM_CAR);
+    receipt = applicationServices.loggedInUserPurchase(TEST_USER_1, ITEM_CAR);
     receipt.show();
-    LOGGER.info("[REQUEST] User: " + "ignite1771" + " buy product: " + "computer");
-    receipt = applicationServices.loggedInUserPurchase("ignite1771", "computer");
+    LOGGER.info(LOGGER_STRING, TEST_USER_1, ITEM_COMPUTER);
+    receipt = applicationServices.loggedInUserPurchase(TEST_USER_1, ITEM_COMPUTER);
     receipt.show();
   }
 }