+ Completed every TODOs

+ Implemented the solution for the question asked in lecture
+ Changed students.txt format to csv

src/main/java/dev/service/StudentManager.java

@@ -10,34 +10,27 @@ public class StudentManager {
     private final ArrayList<Student> students = new ArrayList<>();
 
     public void addStudents(ArrayList<Student> newStudents) {
-
-        // TODO:
-
-        // Merge students
-
-        // Hint:
-        // addAll()
-
+        students.addAll(newStudents);
     }
 
     public Student searchStudent(int id) {
-
-        // TODO:
-
-        // Loop through students
-
-        // Compare IDs
+        for (Student student : students){
+            if (student.getId() == id){
+                return student;
+            }
+        }
 
         return null;
     }
 
     public boolean removeStudent(int id) {
 
-        // TODO:
+        Student student = searchStudent(id);
 
-        // Find student
-
-        // Remove student
+        if (student != null){
+            students.remove(student);
+            return true;
+        }
 
         return false;
     }