поставьте 4 пожалуйста

Demo/Data/Repository/GroupRepositoryImpl.cs

@@ -11,5 +11,38 @@ namespace Demo.Data.Repository
     public class GroupRepositoryImpl
     {
        public List<GroupLocalEntity> GetAllGroups() => LocalStaticData.groups;
+
+        public List<GroupLocalEntity> GetAllGroups
+        { get; set; }
+
+        public bool RemoveGroupById(int id)
+        {
+            GroupLocalEntity? groupLocal = GetAllGroups
+                .Where(x => x.int == id).FirstOrDefault();
+            if (groupLocal == null) return false;
+
+            return GetAllGroup.Remove(groupLocal);
         }
+
+        public GroupLocalEntity? GetGroupByGuid(int id)
+        {
+            GroupLocalEntity? groupLocal = GetAllGroups
+                    .Where(x => x.int == id).FirstOrDefault();
+            if (groupLocal == null) return null;
+
+            return groupLocal;
+        }
+
+        public GroupLocalEntity? UpdateGroup(GroupLocalEntity groupUpdateLocalEnity)
+        {
+            GroupLocalEntity? groupLocal = GetAllGroups
+                    .Where(x => x.int == groupUpdateLocalEnity.id).FirstOrDefault();
+            if (groupLocal == null) return null;
+            groupLocal.Name = groupUpdateLocalEnity.Name;
+            return groupLocal;
+
+        }
+    }
+
+
 }

Demo/Domain/UseCase/GroupUseCase.cs

@@ -0,0 +1,58 @@
+using Demo.Data.Repository;
+using Demo.domain.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.Domain.UseCase
+{
+    public class GroupUseCase
+    {
+        private UserRepositoryImpl _repositoryUserImpl;
+        private GroupRepositoryImpl _repositoryGroupImpl;
+
+        public GroupUseCase(UserRepositoryImpl repositoryImpl, GroupRepositoryImpl repositoryGroupImpl)
+        {
+            _repositoryUserImpl = repositoryImpl;
+            _repositoryGroupImpl = repositoryGroupImpl;
+        }
+
+        public List<Group> GetAllGroups() => _repositoryGroupImpl.GetAllGroups()
+              .Select(it => new Group { Id = it.Id, Name = it.Name }).ToList();
+
+        //public List<User> GetAllUsers() => _repositoryUserImpl.GetAllUsers
+        //      .Join(_repositoryGroupImpl.GetAllGroups(),
+        //      user => user.GroupID,
+        //      group => group.Id,
+        //      (user, group) =>
+        //      new User                                                                                 
+        //      {
+        //          FIO = user.FIO,
+        //          Guid = user.Guid,
+        //          Group = new Group { Id = group.Id, Name = group.Name }
+        //      }
+        //    ).ToList();
+
+        public bool RemoveGroupId(int id)
+        {
+            return _repositoryGroupImpl.RemoveGroupById(id);
+        }
+
+        public List<Group> GetGroupById1(int id)
+        {
+            return _repositoryGroupImpl.GetGroupByid(id);
+        }
+
+        public Group UpdateGroup(Group group)
+        {
+            GroupLocalEnity groupLocalEnity = new GroupLocalEnity { Id = group.Id, Name = group.name };
+            GroupLocalEnity? result = _repositoryGroupImpl.UpdateGroup(groupLocalEnity);
+            if (result == null) throw new Exception("");
+            Group? group = GetAllGroups().FirstOrDefault(it => it.Id == result!.GroupID);
+            if (group == null) throw new Exception("");
+            return new Group { Id = group.Id, Name = group.name };
+        }
+    }
+}

Demo/Domain/UseCase/UserUseCase.cs

@@ -34,6 +34,7 @@ namespace Demo.Domain.UseCase
         public bool RemoveUserByGuid(Guid userGuid) {
            return _repositoryUserImpl.RemoveUserByGuid(userGuid);
         }
+
         public User UpdateUser(User user) {
             UserLocalEnity userLocalEnity = new UserLocalEnity { FIO = user.FIO, GroupID = user.Group.Id, Guid = user.Guid };
             UserLocalEnity? result = _repositoryUserImpl.UpdateUser(userLocalEnity);

Demo/Program.cs

@@ -5,6 +5,6 @@ using Demo.UI;
 
 GroupRepositoryImpl groupRepositoryImpl = new GroupRepositoryImpl();
 UserRepositoryImpl userRepositoryImpl = new UserRepositoryImpl();
-UserUseCase userUseCase = new UserUseCase(userRepositoryImpl, groupRepositoryImpl);
+UserUseCase UserUseCase = new UserUseCase(userRepositoryImpl, groupRepositoryImpl);
 
-MainMenuUI mainMenuUI = new MainMenuUI(userUseCase);
+MainMenuUI mainMenuUI = new MainMenuUI(UserUseCase);

Demo/UI/GroupConsole.cs

@@ -0,0 +1,46 @@
+using Demo.Domain.UseCase;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Demo.UI
+{
+    public class GroupConsoleUI
+    {
+        GroupUseCase _groupUseCase;
+        public UserConsoleUI(GroupUseCase groupUseCase)
+        {
+            _groupUseCase = groupUseCase;
+        }
+
+        public UpdateGroups()
+        {
+            string output = _groupUseCase.UpdateGroup("бла бла бла") ? "Группа обновлена" : "Группа не обновлена";
+            Console.WriteLine(output);
+        }
+
+        public void RemoveGroupByGuid(int id)
+        {
+
+            string output = _groupUseCase.RemoveGroupByGuid(id) ? "Группа удалена" : "Группа не удалена";
+            Console.WriteLine(output);
+        }
+
+        public void GetGroupById(int id)
+        {
+            Console.WriteLine(GetGroupById1(id));
+        }
+
+        public void DisplayAllGroup()
+        {
+            StringBuilder userOutput = new StringBuilder();
+            foreach (var user in _groupUseCase.GetAllGroup())
+            {
+                userOutput.AppendLine($"{group.Id}\t{group.Name}");
+            }
+            Console.WriteLine(userOutput);
+        }
+    }
+}

Demo/UI/MainMenu.cs

@@ -1,6 +1,8 @@
-using Demo.Domain.UseCase;
+using Demo.domain.Models;
+using Demo.Domain.UseCase;
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -18,6 +20,7 @@ namespace Demo.UI
             
         }
 
+
         private void DisplayMenu() {
             while (true)
             {
@@ -25,7 +28,8 @@ namespace Demo.UI
                 {
                     case "1": _userConsoleUI.DisplayAllUsers(); break;
                     case "2": _userConsoleUI.RemoveUserByGuid(Guid.Parse(Console.ReadLine())); break;
-
+                    case "3": _userConsoleUI.UpdateUser(Split(Console.ReadLine())); break;
+                    case "4": _userConsoleUI.GetUserByGuid("614c0a23-5bd5-43ae-b48e-d5750afbc282"); break;
                     default: DisplayMenu();
                         break;
                 }

Demo/UI/UserConsole.cs

@@ -1,7 +1,10 @@
-using Demo.Domain.UseCase;
+using Demo.domain.Models;
+using Demo.Domain.UseCase;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net.Http.Headers;
+using System.Security.Cryptography;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -29,5 +32,23 @@ namespace Demo.UI
             }
             Console.WriteLine(userOutput);
         }
+
+        public void UpdateUser(User user)
+        {
+            try
+            {
+                User updatedUser = _userUseCase.UpdateUser(user);
+                Console.WriteLine($"Пользователь обновлен: {updatedUser.FIO}, Группа: {updatedUser.Group.Name}");
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine($"Произошла ошибка: {ex.Message}");
+            }
+        }
+
+        public void GetUserByGuid(Guid userGuid) {
+            var output = _userUseCase.GetUserByGuid(userGuid);
+            Console.WriteLine(output);
+        }
     }
 }