Fix checkstyle of the project.

Author: codebreaker64

docs/Ui.png

@@ -66,7 +66,6 @@ public String getResponse(String text) throws DevinException, IOException {
                 - `event` \s
                 - `find` \s
                 - `schedule` \s
-                
                 Try one of these!""");
         };
     }

src/main/java/devin/Devin.java

@@ -1,9 +1,6 @@
 package devin.command;
 
 import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Comparator;
 
 import devin.Devin;
 import devin.exception.DevinException;
@@ -189,7 +186,7 @@ public static String findCommand(TaskList list, String[] texts) throws DevinExce
 
     /**
      * A schedule command to find all free time slot and display it to user.
-     * 
+     *
      * @param list of all tasks.
      * @return a message showing all free time slot.
      */

src/main/java/devin/command/Command.java

@@ -37,7 +37,6 @@ public class MainWindow extends AnchorPane {
 
     private AudioClip sendSound = new AudioClip(this.getClass().getResource("/sounds/Send.wav").toString());
     private AudioClip responseSound = new AudioClip(this.getClass().getResource("/sounds/Notification.wav").toString());
-    
     /**
      * Methods to start when the app first initialise
      */
@@ -68,9 +67,9 @@ private void handleUserInput() {
         try {
             sendSound.play(1.0);
             String input = userInput.getText();
-            assert input != null: "There is no user input.";
+            assert input != null : "There is no user input.";
             String response = devin.getResponse(input);
-            assert response != null: "There is no response.";
+            assert response != null : "There is no response.";
             dialogContainer.getChildren().addAll(
                 DialogBox.getUserDialog(input, userImage),
                 DialogBox.getDevinDialog(response, devinImage)

src/main/java/devin/main/MainWindow.java

@@ -34,7 +34,7 @@ public static String[] parseCommand(String input) throws DevinException {
      * @return the converted input.
      */
     public static LocalDateTime parseDate(String input) {
-        assert isValidDate(input): "Invalid date.";
+        assert isValidDate(input) : "Invalid date.";
         return LocalDateTime.parse(input, FORMATTER);
     }
 

src/main/java/devin/parser/Parser.java

@@ -29,9 +29,9 @@ public class Storage {
      */
     public Storage(Path filePath) {
         this.filePath = filePath;
-        assert filePath != null: "There is no file path.";
+        assert filePath != null : "There is no file path.";
         this.parentDir = filePath.getParent();
-        assert parentDir != null: "There is no parent directory.";
+        assert parentDir != null : "There is no parent directory.";
     }
 
     /**

src/main/java/devin/storage/Storage.java

@@ -26,7 +26,7 @@ public Deadline(String description, LocalDateTime by, boolean isDone) {
 
     @Override
     public LocalDateTime getEndTime() {
-        return by; 
+        return by;
     }
 
     @Override

src/main/java/devin/task/Deadline.java

@@ -46,5 +46,4 @@ public String toFileString() {
     public String toString() {
         return "[E]" + super.toString() + " (from: " + from.format(FORMATTER2) + " to: " + to.format(FORMATTER2) + ")";
     }
-    
 }

src/main/java/devin/task/Event.java

@@ -51,11 +51,9 @@ public void markTask() {
     public void unmarkTask() {
         this.isDone = false;
     }
-    
     public LocalDateTime getStartTime() {
         return null;
     }
-    
     public LocalDateTime getEndTime() {
         return null;
     }
@@ -68,6 +66,4 @@ public String toFileString() {
     public String toString() {
         return "[" + getStatusIcon() + "] " + this.name;
     }
-    
-    
 }

src/main/java/devin/task/Task.java

@@ -1,11 +1,9 @@
 package devin.task;
 
 import java.io.IOException;
-import java.time.Duration;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.Comparator;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -42,7 +40,7 @@ public TaskList(ArrayList<Task> tasks) {
     public void addTask(Devin.Type type, String input, Storage storage) throws DevinException, IOException {
         Task task;
         String[] temp = Parser.parseInput(type, input);
-        assert temp.length > 0: "There should be at least one task.";
+        assert temp.length > 0 : "There should be at least one task.";
         switch (type) {
         case todo:
             if (input.trim().isEmpty()) {
@@ -73,7 +71,7 @@ public String listTasks() {
         for (int i = 0; i < tasks.size(); i++) {
             out.append(i + 1).append(". ").append(tasks.get(i).toString()).append("\n");
         }
-        assert !out.isEmpty() : "There is nothing in out." ;
+        assert !out.isEmpty() : "There is nothing in out.";
         return out.toString();
     }
 
@@ -136,22 +134,18 @@ public ArrayList<Task> getTasks() {
 
     /**
      * Find all the free time slot that the user can schedule.
-     * 
+     *
      * @return a message of all free time slot
      */
     public String getTimedTasks() {
         DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d/M/yyyy HHmm");
-        
         LocalDateTime now = LocalDateTime.now();
-        
         ArrayList<Task> timedTasks = tasks.stream()
                 .filter(task -> task.getStartTime() != null && task.getEndTime() != null)
                 .sorted(Comparator.comparing(Task::getStartTime))
                 .collect(Collectors.toCollection(ArrayList::new));
-        
         StringBuilder freeSlots = new StringBuilder();
         LocalDateTime previousEndTime = now;
-
         for (Task task : timedTasks) {
             if (previousEndTime.isBefore(task.getStartTime())) {
                 freeSlots.append("Free slot from ")
@@ -162,12 +156,10 @@ public String getTimedTasks() {
             }
             previousEndTime = task.getEndTime();
         }
-        
         freeSlots.append("Free slot from ")
                 .append(previousEndTime.format(formatter))
                 .append(" to forever")
-                .append("\n"); 
-
+                .append("\n");
         return freeSlots.toString().trim();
     }
 }