public static void PutUserRegister(UserDetails newUserDetails, PostNewRegisterCallback callback)
 {
     DBCommunicator.GetLastUserID(uID =>
     {
         uID.LastUserID += 3;
         DBCommunicator.PostLastUserID(uID, () => { });
         newUserDetails.uId = uID.LastUserID;
         RestClient.Put <UserDetails>($"{databaseURL}Users/{newUserDetails.uId}.json", newUserDetails).Then(response =>
         {
             callback(newUserDetails.uId);
         });
     });
 }