public static String makeCorrect(String str) {
        String correctStr = "";
        char ch;

        for(int i = 0; i < str.length(); i++) {
            ch = str.charAt(i);
            if ((ch >= 'а' && ch <= 'я') || (ch >= 'А' && ch <= 'Я') || ch == 'ё' || ch == 'Ё') {
                if((ch >= 'а') && (ch <= 'я') || ch == 'ё') {
                    ch = Character.toUpperCase(ch);
                }
                correctStr += ch;
            }
        }

        return correctStr;
    }