исправлено 0_о

src/main/java/com/example/nto/service/EmployeeService.java

@@ -14,7 +14,8 @@ import java.util.Optional;
 public interface EmployeeService {
     List<Employee> getAll();
 
-    Optional<Employee> getById(long id);
+    Optional<Employee> getByCode(String code);
 
-    boolean isIdValid(long id);
+
+    boolean isCodeValid(String code);
 }