Clean-up tiny bit

Lab2/src/main/java/org/lumijiez/data/DataDeserializer.java

@@ -1,13 +1,11 @@
 package org.lumijiez.data;
 
-import Project.classes.menu.MainMenu;
 import org.lumijiez.managers.Supervisor;
 
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.ObjectInputStream;
-import java.util.Arrays;
 
 public class DataDeserializer {
     public static Supervisor deserialize() {
@@ -18,7 +16,7 @@ public class DataDeserializer {
                 manager = (Supervisor) ois.readObject();
                 System.out.println("Supervisor object deserialized successfully.");
             } catch (ClassNotFoundException | IOException e) {
-                e.printStackTrace();
+                System.err.println(e.getMessage());
             }
         } else {
             System.out.println("Serialized file 'manager.ser' does not exist.");

Lab2/src/main/java/org/lumijiez/data/DataSerializer.java

@@ -12,7 +12,7 @@ public class DataSerializer {
             oos.writeObject(manager);
             System.out.println("Supervisor object serialized successfully.");
         } catch (IOException e) {
-            e.printStackTrace();
+            System.err.println(e.getMessage());
         }
     }
 }