assertArgumentNotEmpty("inputEncoding", inputEncoding);
        assertArgumentNotNull("out", out);
        assertArgumentNotEmpty("outputEncoding", outputEncoding);

        final Reader is = ReaderUtil.create(in, inputEncoding);
        try {
            final Writer os = WriterUtil.create(out, outputEncoding);
            try {
                return copyInternal(wrap(is), wrap(os));

        Charset inputEncoding = Charset.forName(getInputEncoding().get());

        File destination = getDestinationFile().get().getAsFile();
        Charset outputEncoding = Charset.forName(getOutputEncoding().get());
        try (InputStreamReader inputStream = new InputStreamReader(new FileInputStream(markdownFile), inputEncoding);