Class Main completed.

src/main/java/dev/Main.java

@@ -33,32 +33,35 @@ public class Main {
 
                     List<String> data = FileManager.loadStudents("students.txt");
 
-                    // TODO:
-
-                    // Split data into 3 parts
-
                     List<String> part1 = null;
-
                     List<String> part2 = null;
-
                     List<String> part3 = null;
 
-                    // TODO:
+                    for(int i=0; i<data.size(); i++) {
+                        if (i%3 == 0) {
+                            part1.add(data.get(i));
+                        } else if (i%3 == 1) {
+                            part2.add(data.get(i));
+                        } else {
+                            part3.add(data.get(i));
+                        }
+                    }
 
                     StudentLoader t1 = null;
-
                     StudentLoader t2 = null;
-
                     StudentLoader t3 = null;
 
-                    // TODO:
+                    t1.start();
+                    t2.start();
+                    t3.start();
 
-                    // start()
+                    t1.join();
-
+                    t2.join();
-                    // join()
+                    t3.join();
-
-                    // merge results
 
+                    manager.addStudents(t1.getStudents());
+                    manager.addStudents(t2.getStudents());
+                    manager.addStudents(t3.getStudents());
                 }
 
                 case 2 -> {