7.VendingMachine - C# Fundamentals

using System;

namespace demo
{
    class Program
    {
        static void Main()
        {
            decimal customerMoney = 0m;
            string output = string.Empty;
            string notEnoughMoney = "Sorry, not enought money";

            string commandStart = Console.ReadLine();
            while (true)
            {
                decimal money = decimal.Parse(commandStart);
                bool acceptedCoins = (money == 0.1m || money == 0.2m || money == 0.5m
                                        || money == 1.00m || money == 2.00m);

                if (acceptedCoins)
                {
                    customerMoney += money;
                }

                else
                {
                    Console.WriteLine($"Cannot accept {money}");
                }
                commandStart = Console.ReadLine();
                if (commandStart == "Start")
                {
                    break;
                }
            }

            string commandEnd = Console.ReadLine();
            while (commandEnd != "End")
            {
                string product = commandEnd;
                //bool invalidProduct = (product != "Nuts" || product != "Water" ||
                   //product != "Crisps" || product != "Soda" || product != "Coke");
                bool nuts = product == "Nuts";
                bool water = product == "Water";
                bool crisps = product == "Crisps";
                bool soda = product == "Soda";
                bool coke = product == "Coke";

                if (nuts)
                {
                    if (customerMoney < 2.00m)
                    {
                        Console.WriteLine(notEnoughMoney);
                        commandEnd = Console.ReadLine();
                        continue;
                    }

                    else
                    {
                        Console.WriteLine("Purchased nuts");
                        customerMoney -= 2.00m;
                    }

                }

                else if (water)
                {
                    if (customerMoney < 0.70m)
                    {
                        Console.WriteLine(notEnoughMoney);
                        commandEnd = Console.ReadLine();
                        continue;
                    }

                    else
                    {
                        Console.WriteLine("Purchased water");
                        customerMoney -= 0.70m;
                    }
                }

                else if (crisps)
                {
                    if (customerMoney < 1.50m)
                    {
                        Console.WriteLine(notEnoughMoney);
                        commandEnd = Console.ReadLine();
                        continue;
                    }

                    else
                    {
                        Console.WriteLine("Purchased crisps");
                        customerMoney -= 1.50m;
                    }
                }

                else if (soda)
                {
                    if (customerMoney < 0.80m)
                    {
                        Console.WriteLine(notEnoughMoney);
                        commandEnd = Console.ReadLine();
                        continue;
                    }

                    else
                    {
                        Console.WriteLine("Purchased soda");
                        customerMoney -= 0.80m;
                    }
                }

                else if (coke)
                {
                    if (customerMoney < 1.00m)
                    {
                        Console.WriteLine(notEnoughMoney);
                        commandEnd = Console.ReadLine();
                        continue;
                    }

                    else
                    {
                        Console.WriteLine("Purchased coke");
                        customerMoney -= 1.00m;
                    }
                }

                else
                {
                    Console.WriteLine("Invalid product");
                    commandEnd = Console.ReadLine();
                    continue;
                }



                commandEnd = Console.ReadLine();
            }

            Console.WriteLine($"Change: {customerMoney}");
        }
    }
}