src/main/java/org/apache/commons/text/StrBuilder.java [2658:2689]:
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        if (size == 0) {
            return this;
        }

        final int half = size / 2;
        final char[] buf = buffer;
        for (int leftIdx = 0, rightIdx = size - 1; leftIdx < half; leftIdx++, rightIdx--) {
            final char swap = buf[leftIdx];
            buf[leftIdx] = buf[rightIdx];
            buf[rightIdx] = swap;
        }
        return this;
    }

    /**
     * Extracts the rightmost characters from the string builder without throwing an exception.
     * <p>
     * This method extracts the right {@code length} characters from the builder. If this many characters are not available, the whole builder is returned. Thus
     * the returned string may be shorter than the length requested.
     * </p>
     *
     * @param length the number of characters to extract, negative returns empty string
     * @return The new string
     */
    public String rightString(final int length) {
        if (length <= 0) {
            return StringUtils.EMPTY;
        }
        if (length >= size) {
            return new String(buffer, 0, size);
        }
        return new String(buffer, size - length, length);
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src/main/java/org/apache/commons/text/TextStringBuilder.java [2929:2960]:
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        if (size == 0) {
            return this;
        }

        final int half = size / 2;
        final char[] buf = buffer;
        for (int leftIdx = 0, rightIdx = size - 1; leftIdx < half; leftIdx++, rightIdx--) {
            final char swap = buf[leftIdx];
            buf[leftIdx] = buf[rightIdx];
            buf[rightIdx] = swap;
        }
        return this;
    }

    /**
     * Extracts the rightmost characters from the string builder without throwing an exception.
     * <p>
     * This method extracts the right {@code length} characters from the builder. If this many characters are not
     * available, the whole builder is returned. Thus the returned string may be shorter than the length requested.
     * </p>
     *
     * @param length the number of characters to extract, negative returns empty string
     * @return The new string
     */
    public String rightString(final int length) {
        if (length <= 0) {
            return StringUtils.EMPTY;
        }
        if (length >= size) {
            return new String(buffer, 0, size);
        }
        return new String(buffer, size - length, length);
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