static void Main(string[] args)
{
CalculatorVersionTwo calculator = new CalculatorVersionTwo();
int x = 20;
Console.WriteLine(x.IsGreaterThan(10));
Console.WriteLine(x.IsLessThan(5));
}
public static string ConcatStrings(this CalculatorVersionTwo calculator, string firstString, string secondString)
{
return(firstString + secondString);
}