srp_before.swift

func main() {
    guard let inputedNumber = InputView.read() else { return }  //값 입력받음
    let burgers = GodOfHamburger.hamburger(with: inputedNumber) //햄버거 신에게 해당 개수만큼 햄버거 받음
    print(burgers)  //햄버거 출력
}

main()

class InputView {
    static func read() -> Int? {
        let string = readLine() ?? ""
        let numbers = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9",]
        guard numbers.contains(string) else { return nil }
        return Int(string)
    }
}

class GodOfHamburger {
    static func hamburger(with number: Int) -> [String] {
        return Array(repeating: "🍔", count: number)
    }
}