upload

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

@@ -41,4 +41,18 @@ public class TaskManager {
     }
     return this.taskMap.get(taskID);
   }
+
+  public void deleteTask(String name) {
+    if (name == null ) {
+
+      throw new IllegalArgumentException("Name is null!");
+    }
+    if(name.isEmpty() || this.taskMap.values().stream().anyMatch(t -> t.getName().equals(name))) {
+      throw new IllegalArgumentException("Wrong name!");
+    }
+
+    this.taskMap.remove(this.taskMap.values().stream().filter(t -> t.getName().equals(name)).findFirst()
+            .orElseThrow(() -> new IllegalArgumentException("Cant find a Task")).getTaskID());
+
+  }
 }