upload

src/main/java/hhn/temp/project/TaskManager.java

@@ -1,5 +1,7 @@
 package hhn.temp.project;
 
+import hhn.temp.project.expections.TaskAlreadyExistsException;
+
 import java.util.HashMap;
 import java.util.Map;
 
@@ -12,9 +14,14 @@ public class TaskManager {
   }
 
   public Task createTask(String name, String description) {
+
+    boolean taskExited = this.taskMap.values().stream().anyMatch(task -> task.getName().equals(name));
+    if(taskExited) {
+      throw new TaskAlreadyExistsException("Task already exits, with the name: " + name);
+    }
+
     Task task = new Task(name, description);
     taskMap.put(task.getTaskID(), task);
-
     return task;
   }
 }

src/main/java/hhn/temp/project/expections/TaskAlreadyExistsException.java

@@ -0,0 +1,8 @@
+package hhn.temp.project.expections;
+
+public class TaskAlreadyExistsException extends RuntimeException {
+
+  public TaskAlreadyExistsException(String message) {
+    super(message);
+  }
+}