code: static String capitalizeFirstWordAsciiOnly(String s) {
      if (s == null || s.isEmpty()) {
        return s;
      }
      int secondWordStart = s.length();
      for (int i = 1; i < s.length(); i++) {
        if (!isLowerCaseAsciiOnly(s.charAt(i))) {
          secondWordStart = i;
          break;
        }
      }
      return toUpperCaseAsciiOnly(s.substring(0, secondWordStart)) + s.substring(secondWordStart);
    }
docs: "fooBar" -> "FOOBar"
  "FooBar" -> "FOOBar"
  "foo" -> "FOO"