앞으로 스팟에서 사용할 뷰모델 패턴 > SwiftUI + Combine 사용시 꽤 괜찮아 보인다!
// https://levelup.gitconnected.com/building-an-ios-app-using-swiftui-combine-mvvm-part-2-a0a703269907 // https://github.com/quickbirdstudios/SwiftUI-Architectures/blob/master/QBChat-MVVM/QBChat-MVVM/MVVM/ViewModel.swift