private String addExtension(String path) {
            if (!StringUtils.isBlank(path) && !path.endsWith(extension)) {
                path += extension;
            }
            return path;
        }
Constructor.
@param wrapped The symbol provider to wrap.
@param extension The file extension to add. This must include any necessary periods.
smithy-docgen/src/main/java/software/amazon/smithy/docgen/DocSymbolProvider.java