Index: iknow-api/Repository/Implementations/UserRepository.cs
===================================================================
--- iknow-api/Repository/Implementations/UserRepository.cs	(revision ff202cffe227f3226587a67fc50b6f4defb4418a)
+++ iknow-api/Repository/Implementations/UserRepository.cs	(revision c2f79d73d7219c8c8bcc00f5badba27a707b22be)
@@ -1,5 +1,4 @@
 using iknow_api.Models;
 using iknow_api.Data;
-using iknow_api.Models;
 using Microsoft.EntityFrameworkCore;
 
@@ -64,4 +63,5 @@
             return await _context.User.CountAsync();
         }
+
     }
 }
Index: iknow-api/Repository/Interface/IUserRepository.cs
===================================================================
--- iknow-api/Repository/Interface/IUserRepository.cs	(revision ff202cffe227f3226587a67fc50b6f4defb4418a)
+++ iknow-api/Repository/Interface/IUserRepository.cs	(revision c2f79d73d7219c8c8bcc00f5badba27a707b22be)
@@ -1,3 +1,3 @@
-using iknow_api.Models;
+using iknow_api.Models;
 namespace iknow_api.Repositories
 {
@@ -11,5 +11,5 @@
         Task AddHighSchoolAsync(HighSchool highSchool);
         Task<int> GetUsersCountAsync();
-        Task<User> GetUserByIdAsync(int id);
+        Task<User?> GetUserByIdAsync(int id);
         Task<User?> GetOnlyUserByIdAsync(int id);