@dp.message_handler(state='*', commands=["start", "cancel"])
@dp.message_handler(Text(equals=['начать', "отмена"], ignore_case=True), state='*')
async def send_welcome(message: types.Message, state: FSMContext):
    await state.finish()
    img = open("./logo.jpg", "rb")
    await bot.send_photo(message.chat.id, img,
                   caption="Добро пожаловать на платформу онлайн тестирования",
                   reply_markup=main_menu(message))



async def back_main_menu(message):
    await bot.edit_message_caption("Добро пожаловать на платформу онлайн тестирования", message.chat.id, message.message_id,
                             reply_markup=main_menu(message))

@dp.callback_query_handler(lambda c: c.data == 'exit')
async def exit_user(callback_query: types.CallbackQuery):
    await bot.answer_callback_query(callback_query.id)
    user_id = callback_query.from_user.id
    r = requests.post(http_getusertoken, json={"password": "1488", "telegram_id": int(user_id)})
    TOKEN_USER = r.json()["access_token"]
    headers = {"Authorization": "Bearer " + TOKEN_USER}
    requests.post('https://xxxxx.ru/api/telegram4ik/removeusertelegram',
                  json={"password": "xxxx", "telegram_id": user_id}, headers=headers)
    await send_welcome(callback_query.message,)