Juego de cartas "21" en consola con C#

1System.Random random = new System.Random();
2
3
4// Welcome
5Console.WriteLine("HELLO, WELCOME!!");
6Console.WriteLine("Don you want to play 21 or another videogame? => Yes/No");
7
8// Variables
9string confirmStar = Console.ReadLine();
10int numberCoin;
11int computerCart;
12int playerCart;
13string desicion;
14int totalPlayer;
15string seconDesicion;
16int num = 0;
17string endDesicion;
18
19// Confirmación de entrada - estado
20switch (confirmStar)
21{
22    case "Yes":
23        Console.WriteLine("How many coins do you have?");
24        numberCoin = Convert.ToInt32(Console.ReadLine());
25        Console.WriteLine($"Great, you have {numberCoin} opportunities");
26        for (int i = 0; i < numberCoin; i++) {
27            Console.WriteLine("Take a card => Yes/No");
28            desicion = Console.ReadLine();
29            switch (desicion) {
30                case "Yes":
31                    computerCart = random.Next(12, 21);
32                    playerCart = random.Next(1, 25);
33                    Console.WriteLine($"Your card is {playerCart}");
34                    Console.WriteLine("Do you want to take other card? => Yes/No");
35                    seconDesicion = Console.ReadLine();
36
37                    switch (seconDesicion) {
38                        case "No":
39                            if (playerCart > computerCart && playerCart <= 21) {
40                                Console.WriteLine($"Your card is: {playerCart} and The computer is: {computerCart}");
41                                Console.WriteLine("Congratulation, you win!!");
42                            } else if (playerCart < computerCart || playerCart == computerCart) {
43                                Console.WriteLine($"Your card is: {playerCart} and The computer is: {computerCart}");                               
44                                Console.WriteLine("You lost, game over!! :(");
45                            } else {
46                                Console.WriteLine("Invalid Code");
47                            }
48                            break;
49
50                        case "Yes":
51                            totalPlayer = playerCart;
52                            totalPlayer = totalPlayer + random.Next(1, 21);
53                            Console.WriteLine($"Your card is: {totalPlayer}");
54                            Console.WriteLine("Do you want other card? => Yes/No");
55                            endDesicion = Console.ReadLine();      
56                            while (endDesicion == "Yes" && totalPlayer < 21) {
57                                totalPlayer = totalPlayer + random.Next(1, 21);
58                                Console.WriteLine($"Your card is: {totalPlayer}");
59                                Console.WriteLine("Do you want other card? => Yes/No ");
60                                endDesicion = Console.ReadLine();  
61                            }
62
63                            if (totalPlayer > computerCart && totalPlayer <= 21) {
64                                Console.WriteLine($"Your card is: {totalPlayer} and The computer is: {computerCart}");
65                                Console.WriteLine("Congratulation, you win!!");
66                            } else if (totalPlayer < computerCart || totalPlayer == computerCart) {
67                                Console.WriteLine($"Your card is: {totalPlayer} and The computer is: {computerCart}");                               
68                                Console.WriteLine("You lost, game over!! :(");
69                            } else if (totalPlayer > 21) {
70                                Console.WriteLine($"Sorry but your card is: {totalPlayer}, game over, you lost!! :(");
71                            }
72                            break;
73
74                        default:
75                            Console.WriteLine("Invalid Code");
76                            break;
77                    }
78
79                    break;
80                default:
81                    Console.WriteLine("Invalid Error");
82                    break;
83            }      
84            Console.WriteLine("-----------  THIS ROUND HAS ENDED, LETS'GO WITH THE NEXT  -----------");                
85        }
86        break;
87    case "No":
88        Console.WriteLine("You're screwed because there is only 21");
89        break;
90    default:
91        Console.WriteLine("Invalid code");
92        break;
93}