public IActionResult Index(string searchTerm)
        {
            var user        = userService.GetCurrentUser();
            var userFriends = user.Friends;

            // Take user's friends whose names begin contain the search term.
            if (!string.IsNullOrWhiteSpace(searchTerm))
            {
                userFriends = userFriends.Where(user =>
                                                user.FirstName.ToLower().Contains(searchTerm.ToLower()) ||
                                                user.LastName.ToLower().Contains(searchTerm.ToLower())).ToList();
            }

            var startedChatViewModels = new List <StartedChatViewModel>();

            foreach (var friend in userFriends)
            {
                var friendViewModel      = mapper.Map <FriendViewModel>(friend);
                var lastFriendMessage    = messengerService.GetLastUsersMessage(user.Login, friend.Login);
                var lastMessageViewModel = mapper.Map <MessageViewModel>(lastFriendMessage);

                if (lastMessageViewModel != null)
                {
                    lastMessageViewModel.Text = TruncateLongString(lastMessageViewModel.Text, 40);
                }

                startedChatViewModels.Add(new StartedChatViewModel()
                {
                    Friend      = friendViewModel,
                    LastMessage = lastMessageViewModel
                });
            }

            startedChatViewModels = startedChatViewModels.OrderByDescending(startedChat => startedChat.LastMessage?.Date)
                                    .ToList();

            return(View(startedChatViewModels));
        }