bool FBullCowGame::IsIsogram(FString Guess) const
{
	// treat 0 & 1 letter words as isograms
	if (Guess.length() <= 1) { return true; }
	// setup map
	TMap<char, bool> LetterSeen;

	// loop through each letter in guess
	for (auto Letter : Guess)
	{
		Letter = tolower(Letter);	// Allows mixed Case Guesses
		if (LetterSeen[Letter])
			// we do NOT have isogram
			return false;
		else
			// add it to the map
			LetterSeen[Letter] = true;
	}

	return true;
}