MainViewModel.kt

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    val timeLeft: LiveData<Int> get() = _timeLeft
    private val _timeLeft = MutableLiveData(60)
    private val countDownTimer = flow {
        for (timeLeftOnTimer in 60 downTo 0){
            emit(timeLeftOnTimer)
            delay(1000)
        }
    }

    fun startCountDownTimer(){
        score = 1
        _liveScore.value = score
        isGameStarted = true
        viewModelScope.launch {
            try {
                countDownTimer.collect{ timeLeft ->
                    _timeLeft.value = timeLeft
                }
            } finally {
                channel.send(score)
                resetGame()
            }
        }
    }
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