presense/Demo/UI/UserConsole.cs

using System.Text;

namespace Demo.UI
{
    public class UserConsoleUI
    {
        UserUseCase _userUseCase;
        public UserConsoleUI(UserUseCase userUseCase) {
            _userUseCase = userUseCase;
        }

        public void RemoveUserByGuid(Guid guidUser) {

            string output = _userUseCase.RemoveUserByGuid(guidUser) ? "Пользователь удален" : "Пользователь не удален";
            Console.WriteLine(output);
        }

        public void DisplayAllUsers()
        {
            StringBuilder userOutput = new StringBuilder();
            foreach (var user in _userUseCase.GetAllUsers())
            {
                userOutput.AppendLine($"{user.Guid}\t{user.FIO}\t{user.Group.Name}");
            }
            Console.WriteLine(userOutput);
        }
    }
}