/*  Create a function that takes a word 
 ~  and returns true if the word has two consecutive identical letters.
 */
bool double_letters(std::string word) {
	for (int i=0;i<word.size();i++){
		// get current character of "word", compare with next character
		if (word[i] == word[i+1]) {
			return true;
		}
	}
	return false;
}