Admin cannot block employee if it is admin too

src/main/java/com/example/nto/controller/AdminController.java

@@ -67,7 +67,9 @@ public class AdminController {
             throw new EmployeeNotFoundException();
         }
 
-
+        if (("" + employee.get().getRole()).equals("ADMIN")) {
+            throw new EmployeeIsAdminException();
+        }
 
         employeeService.block(employee.get().getId());