目前，我正在对2到3个不同的API进行API调用，其中第二个API调用依赖于第一个API调用的数据。然而，编译器甚至在第一个函数完成之前就调用了第二个函数，从而导致错误。我如何才能在第一个函数完成之后才调用第二个函数呢？谢谢

/**
     *  Function to get Bus Timings depending on Bus Service No. or Bus Stop Code
     */
    fun determineUserQuery(userInput: String) {
        // Determine if User Provided a Bus Service No. or Bus Stop Code
        val userInputResult = determineBusServiceorStop(userInput)
        viewModelScope.launch {
            if (userInputResult.busServiceBool) {
                busServiceBoolUiState = true
                coroutineScope {
                    // Provided Bus Service, Need get Route first
                    getBusRoutes(targetBusService = userInputResult.busServiceNo)
                }
                delay(2000)
                // Get the Bus Timing for Each Route
                Log.d("debug2", "String ${_busRouteUiState.value.busRouteArray}")
                getMultipleBusTimings(busRoutes = _busRouteUiState.value.busRouteArray)
            }
            else {
                // Provided Bus Stop Code
                coroutineScope {
                    launch {
                        getBusStopNames(targetBusStopCode = userInputResult.busStopCode?.toInt())
                    }
                    launch {
                        getBusTimings(userInput = userInputResult.busStopCode)
                    }
                }
            }

        }
    }