refactoring: letter_in_secret_word --> Buchstabe_im_zu_erratenden_wort

src/main/c/hangman.c

@@ -19,7 +19,7 @@ void erratenen_buchstaben_hinzufuegen(char* guessed_letters, char guessed_letter
 char eingabe_buchstabe();
 void hole_zu_erratendes_wort(char* secret_word, int level, char* path);
 void zeige_Buchstabenfeld(char secret_word[100], char guessed_letters[100]);
-int letter_in_secret_word(char guessed_letter, char secret_word[100]);
+int buchstabe_im_zu_erratenden_wort(char guessed_letter, char secret_word[100]);
 int has_won(char secret_word[100], char guessed_letters[100]);
 void level_plus();
 int overlay();
@@ -183,7 +183,7 @@ void hauptSpiel(int level){
 		zeichne_galgen(versuche);
 		zeige_Buchstabenfeld(secret_word, guessed_letters);
 		guessed_letter = eingabe_buchstabe();
-		result = letter_in_secret_word(guessed_letter, secret_word);
+		result = buchstabe_im_zu_erratenden_wort(guessed_letter, secret_word);
 		if (result == 0){
 			erratenen_buchstaben_hinzufuegen(guessed_letters, guessed_letter);
 		}
@@ -324,7 +324,7 @@ void zeige_Buchstabenfeld(char secret_word[100], char guessed_letters[100]){
 	printf("\n");
 }
 
-int letter_in_secret_word(char guessed_letter, char secret_word[100]){
+int buchstabe_im_zu_erratenden_wort(char guessed_letter, char secret_word[100]){
 	for(int i = 0; i < strlen(secret_word); i++){
 		if(guessed_letter == secret_word[i]){
 			return 0;