private String stemming(String word) {
        String new_word;
        try {
            new_word = stemmer.stem(word);
            if (new_word.contains("No term") || new_word.contains("Invalid term")) {
                new_word = word;
            }
        } catch (Exception e) {
            new_word = word;
        }
        return new_word;
    }
Extract the information from links as word in the URL, anchor and around links, and converts
it to an Instance object

@param linkNeighboors The LinkNeighborhood instances to be converted to Instance
@param features String[] pre-defined words
@return HashMap mapping url -> instance
ache/src/main/java/achecrawler/link/classifier/builder/LinkNeighborhoodWrapper.java