Finishing TODO parts

src/main/java/dev/Main.java

@@ -37,28 +37,40 @@ public class Main {
 
                     // Split data into 3 parts
 
-                    List<String> part1 = null;
+                    int size = data.size();
 
-                    List<String> part2 = null;
-
-                    List<String> part3 = null;
+                    List<String> part1 = data.subList(0, size / 3);
+                    List<String> part2 = data.subList(size / 3, 2 * size / 3);
+                    List<String> part3 = data.subList(2 * size / 3, size);
 
                     // TODO:
 
-                    StudentLoader t1 = null;
+                    StudentLoader t1 = new StudentLoader(part1);
 
-                    StudentLoader t2 = null;
+                    StudentLoader t2 = new StudentLoader(part2);
 
-                    StudentLoader t3 = null;
+                    StudentLoader t3 = new StudentLoader(part3);
 
                     // TODO:
 
                     // start()
 
+                    t1.start();
+                    t2.start();
+                    t3.start();
+
                     // join()
 
+                    t1.join();
+                    t2.join();
+                    t3.join();
+
                     // merge results
 
+                    manager.addStudents(t1.getStudents());
+                    manager.addStudents(t2.getStudents());
+                    manager.addStudents(t3.getStudents());
+
                 }
 
                 case 2 -> {
@@ -96,4 +108,4 @@ public class Main {
 
     }
 
-}
+}