check single letter

src/main/c/Hangman/playHangman.c

@@ -24,6 +24,12 @@ void playHangman(char *wordToGuess) {
             continue;
         }
 
+        // Check if the guess is a single letter
+        if (strlen(&guess) != 1) {
+            printf("Please enter only one letter.\n");
+            continue;
+        }
+
         // Check if the letter has already been guessed by the player
         if (strchr(guessedLetters, guess) != NULL) {
             printf("You already guessed that letter. Try another letter.\n");