fix: some functions

Dental_Clinic_System/Dental_Clinic_System/Areas/Dentist/Controllers/ChatController.cs

@@ -53,8 +53,8 @@ public async Task<IActionResult> ChatList()
                     Timestamp = m.Timestamp,
                     SenderId = m.SenderId,
                     ReceiverId = m.ReceiverId,
-                    SenderName = m.Sender.FirstName ?? "Ẩn" + " " + m.Sender.LastName ?? "Danh",
-                    ReceiverName = m.Receiver.FirstName ?? "Ẩn" + " " + m.Receiver.LastName ?? "Danh"
+                    SenderName = m.Sender.FirstName + " " + m.Sender.LastName,
+                    ReceiverName = m.Receiver.FirstName + " " + m.Receiver.LastName
                 })
                 .GroupBy(m => m.SenderId == dentistID ? m.ReceiverId : m.SenderId)
                 .Select(g => g.OrderByDescending(m => m.Timestamp).FirstOrDefault())

Dental_Clinic_System/Dental_Clinic_System/Controllers/AccountController.cs

@@ -1218,6 +1218,7 @@ public async Task<IActionResult> CancelAppointment(int appointmentID, int schedu
             if (appointment.AppointmentStatus == "Đã Hủy")
             {
                 appointment.Schedule.ScheduleStatus = "Đã Hủy";
+                appointment.Description = $"Hủy khám từ bệnh nhân lúc {Util.GetUtcPlus7Time()}";
                 await _context.SaveChangesAsync();
             }
 

Dental_Clinic_System/Dental_Clinic_System/Views/Shared/_Header.cshtml

@@ -32,7 +32,7 @@
                 <a asp-area="" asp-controller="news" asp-action="index">Tin Tức</a>
             </li>
             <li>
-                <a asp-controller="contact" asp-action="index">Liên hệ</a>
+                <a asp-controller="contact" asp-action="index">Hợp tác</a>
             </li>
         </ul>