private static void Main()
        {
            var log       = new Log();
            var userTasks = new UserTasks();

            do
            {
                PrintMenu();
                var userInput = userTasks.GetUserInput();
                try
                {
                    switch (userInput)
                    {
                    case 1:
                    {
                        //1. Add numbers
                        var firstNumber  = userTasks.GetUserInput("Please enter the first number: ");
                        var secondNumber = userTasks.GetUserInput("Please enter the second Number: ");
                        var result       = userTasks.AddNumbers(firstNumber, secondNumber);
                        Console.WriteLine("The result is: " + result);
                        log.WriteToLog(
                            $"Add Numbers: The user typed first number = {firstNumber}, second number = {secondNumber} and the result = {result}");
                        break;
                    }

                    case 2:
                    {
                        //2.Mul numbers
                        var firstNumber  = userTasks.GetUserInput("Please enter the first number: ");
                        var secondNumber = userTasks.GetUserInput("Please enter the second Number: ");
                        var result       = userTasks.MultiplyNumbers(firstNumber, secondNumber);
                        Console.WriteLine(
                            "The result is: " + userTasks.MultiplyNumbers(firstNumber, secondNumber));
                        log.WriteToLog(
                            $"Mul Numbers: The user typed first number = {firstNumber}, second number = {secondNumber} and the result = {result}");
                        break;
                    }

                    case 3:
                    {
                        //3.Divide numbers
                        var firstNumber  = userTasks.GetUserInput("Please enter the first number: ");
                        var secondNumber = userTasks.GetUserInput("Please enter the second Number: ");
                        var result       = userTasks.DivideNumbers(firstNumber, secondNumber);
                        Console.WriteLine("The result is: " + result);
                        log.WriteToLog(
                            $"Divide Numbers: The user typed first number = {firstNumber}, second number = {secondNumber} and the result = {result}");
                        break;
                    }

                    case 4:
                    {
                        //4.Show odd numbers in range
                        var firstNumberInRange =
                            userTasks.GetUserInput("Please enter the first number in range: ");
                        var lastNumberInRange = userTasks.GetUserInput("Please enter the last Number in range: ");
                        var oddNumbersInRange =
                            userTasks.ShowOddNumbersInRange(firstNumberInRange, lastNumberInRange);
                        log.WriteToLog(
                            $"Odd Numbers: The user typed first number in range = {firstNumberInRange}, last number in range = {lastNumberInRange} and the odd numbers are: {oddNumbersInRange}");
                        break;
                    }

                    case 5:
                    {
                        //5.print square
                        var squareSize = userTasks.GetUserInput("Please enter the size of the square: ");
                        userTasks.PrintSquare(squareSize);
                        log.WriteToLog($"Print Square: The user typed the number {squareSize}");
                        break;
                    }

                    case 6:
                    {
                        //6.Print triangle
                        var triangleSize = userTasks.GetUserInput("Please enter the size of the triangle: ");
                        userTasks.PrintTriangle(triangleSize);
                        log.WriteToLog($"Print Triangle: The user typed the number {triangleSize}");
                        break;
                    }

                    case 7:
                    {
                        //7. Think for X seconds
                        var secondsToThink = userTasks.GetUserInput("How many second to think?: ");
                        userTasks.ThinkInSeconds(secondsToThink);
                        log.WriteToLog($"Think for X seconds: The user typed the number {secondsToThink}");
                        break;
                    }

                    case 8:
                    {
                        //8. Display the log file
                        Console.Write(log.GetLog());
                        break;
                    }

                    case 9:
                    {
                        //9.Exit
                        return;
                    }

                    default:
                    {
                        continue;
                    }
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine(string.IsNullOrEmpty(e.Message) ? e.ToString() : e.Message);
                }
                Console.WriteLine("Press enter to continue");
                Console.ReadLine();
            } while (true);
        }