do not use datastore in command

service/src/main/java/commands/RegisterTasksCommand.java

@@ -34,14 +34,12 @@ public class RegisterTasksCommand extends ConfiguredCommand<ApplicationConfigura
 
     private void initializeTasks(ApplicationConfiguration applicationConfiguration, Injector injector)
     {
-        Datastore datastore = injector.getInstance(Datastore.class); //todo: do not use datastore?
         TasksRepository tasksRepository = injector.getInstance(TasksRepository.class);
 
         List<TextTaskConfig> cryptoTasks = applicationConfiguration.getTextTasks();
         List<WebTaskConfig> webTasks = applicationConfiguration.getWebTasks();
 
-        datastore.getCollection(Task.class).drop();
-
+        tasksRepository.clean();
         cryptoTasks.forEach(cryptoTaskConfig -> {
 
             cryptoTaskConfig.getFlags().stream()

service/src/main/java/repositories/TasksRepository.java

 package repositories;
 
 import core.ApplicationConfiguration;
-import core.TaskType;
-import helpers.TextTaskConfig;
-import helpers.WebTaskConfig;
 import helpers.DBObjectUtils;
-import objects.Flag;
 import objects.Solution;
 import objects.Team;
 import objects.tasks.Task;
-import objects.tasks.TaskCryptoContent;
-import objects.tasks.TaskWebContent;
 import org.apache.commons.codec.binary.Hex;
 import org.mongodb.morphia.Datastore;
 
@@ -112,4 +106,9 @@ public class TasksRepository implements Repository
         }
         return false;
     }
+
+    public void clean()
+    {
+        datastore.getCollection(Task.class).drop();
+    }
 }
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