added various fields inside the dropdown

src/main/java/com/rit/whatsapp/service/SessionService.java

@@ -19,6 +19,7 @@ public class SessionService {
     // In-memory cache for API session tokens
     private final Map<String, String> sessionTokens = new ConcurrentHashMap<>();
     private final Map<String, String> temporaryLoginIds = new ConcurrentHashMap<>();
+    private final Map<String, String> studentNames = new ConcurrentHashMap<>();
 
     private final UserRepository userRepository;
     private final EncryptionUtils encryptionUtils;
@@ -90,9 +91,19 @@ public class SessionService {
             imsApiService.logout(token);
         }
         userRepository.deleteById(phoneNumber);
+        studentNames.remove(phoneNumber);
         resetState(phoneNumber);
     }
 
+    public String getStudentName(String phoneNumber, String token) {
+        if (studentNames.containsKey(phoneNumber)) {
+            return studentNames.get(phoneNumber);
+        }
+        String name = imsApiService.getStudentName(token);
+        studentNames.put(phoneNumber, name);
+        return name;
+    }
+
     public void setTempLoginId(String phoneNumber, String tempId) {
         temporaryLoginIds.put(phoneNumber, tempId);
     }