class StringUtil {

    @NonNull
    public static String getBase26String(@IntRange(from = 1) int number) {
        final int base = 26;
        String str = "";
        while (--number >= 0) {
            str = (char)('A' + number % base) + str;
            number /= base;
        }
        return str;
    }

    private  StringUtil();

}