public void UserCommands(string args)
{
string[] command = args.Split(' ');
if (command.Length == 1)
{
DisplayUserInformation(command[0]);
}
else if (command.Length == 2)
{
UserBuysProduct(command[0], command[1]);
}
else
{
ui.DisplayTooManyArguementsError(command.Length.ToString());
}
}