Tidy code

Let's,
* remove unnecessary comments
* store printed String in a static variable
* remove unnecessary methods and method calls

src/main/java/seedu/address/MainApp.java

@@ -80,12 +80,8 @@ private Model initModelManager(Storage storage, ReadOnlyUserPrefs userPrefs) {
         try {
             campusConnectOptional = storage.readCampusConnect();
             if (!campusConnectOptional.isPresent()) {
-                // logger.info("Creating a new data file " + storage.getCampusConnectFilePath()
-                //         + " populated with a sample CampusConnect.");
-
                 logger.info("Creating a new data file at: " + storage.getCampusConnectFilePath());
             }
-            // initialData = campusConnectOptional.orElseGet(SampleDataUtil::getSampleCampusConnect);
             initialData = campusConnectOptional.orElseGet(EmptyDataUtil::getSampleCampusConnect);
         } catch (DataLoadingException e) {
             logger.warning("Data file at " + storage.getCampusConnectFilePath() + " could not be loaded."

src/main/java/seedu/address/logic/commands/AbstractFindCommand.java

@@ -47,7 +47,7 @@ public CommandResult execute(Model model) {
 
         // if the result find list is empty
         if (model.getFilteredPersonList().isEmpty()) {
-            return new CommandResult(String.format(MESSAGE_NO_PERSONS_FOUND));
+            return new CommandResult(MESSAGE_NO_PERSONS_FOUND);
         }
 
         return new CommandResult(

src/main/java/seedu/address/ui/MainWindow.java

@@ -25,6 +25,8 @@ public class MainWindow extends UiPart<Stage> {
 
     private static final String FXML = "MainWindow.fxml";
 
+    private static final String LIST_EMPTY_MESSAGE = "The contact list is empty! :(";
+
     private final Logger logger = LogsCenter.getLogger(getClass());
 
     private Stage primaryStage;
@@ -116,7 +118,7 @@ void fillInnerParts() {
         resultDisplay = new ResultDisplay();
         resultDisplayPlaceholder.getChildren().add(resultDisplay.getRoot());
         if (logic.getFilteredPersonList().isEmpty()) {
-            resultDisplay.setFeedbackToUser("The contact list is empty! :(");
+            resultDisplay.setFeedbackToUser(LIST_EMPTY_MESSAGE);
         }
 
         StatusBarFooter statusBarFooter = new StatusBarFooter(logic.getCampusConnectFilePath());