private Map<String, WordField[]> extractLinks(LinkNeighborhood[] linkNeighboors)
            throws MalformedURLException {
        Map<String, WordField[]> result = new HashMap<>();
        for (LinkNeighborhood linkNeighboor : linkNeighboors) {
            extractToMap(result, linkNeighboor);
        }
        return result;
    }
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