Adding courseExists method in Course class

src/main/java/org/example/Course.java

@@ -151,4 +151,14 @@ public class Course {
         Course course = new Course();
         course.writeToFile(courseName, courseCode, courseCredit, filename);
     }
+
+    private static boolean courseExists(String filename, String name, String code) {
+        List<Course> courses = readFromFile(filename);
+        for (Course course : courses) {
+            if (course.getCourseName().equalsIgnoreCase(name) || course.getCourseCode().equalsIgnoreCase(code)) {
+                return true; // Course with the same name or code already exists
+            }
+        }
+        return false; // No course with the same name or code found
+    }
 }