private Engine(CommandExecuter executor, IUserInterface userIo)
{
this.executor = executor;
this.userIO = userIo;
//// DI: Added IUserInterface and ConsoleIo types
//// and made the constructor take an user interface usin DI
}
private Engine(CommandExecuter executor, IUserInterface userIo)
{
this.executor = executor;
this.userIO = userIo;
}