refactoring + some bugs fixed

src/main/c/Hangman/playHangman.c

@@ -55,22 +55,32 @@ void playHangman(char *wordToGuess) {
         printf("Enter your guess: \n");
         scanf("%s", input);
 
-        // Check if a valid character is entered
-        if (guess == '\0') {
+        // Check if the input is a single letter
+        if(strlen(input) > 1) {
             printf("Invalid input. Please enter a single letter.\n");
             continue;
         }
 
+        // Check if the input is an alphabet
+        char guess = input[0];
+        if (!isalpha(guess)) {
+            printf("Please enter a valid alphabet.\n");
+            continue;
+        }
+
         // Convert uppercase letter to lowercase
         guess = toLower(guess);
 
-        // Check if the guess is a letter (valid)
-        if (!isalpha(guess)) {
-            printf("Please enter a valid alphabet.\n");
-            ignoreExtraInput();
+        // 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");
             continue;
         }
 
+        // Add the guessed letter to the list
+        guessedLetters[strlen(guessedLetters)] = guess;
+
+
         // 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");