public Set<String> parseFiles(InputStream file) throws IOException {
        Set<String> stopwords = new HashSet<>();
        for (String line : readLines(file)) {
            stopwords.add(line.trim());
        }
        return stopwords;
    }
Checks if word is irrelevant. A word is considered irrelevant if:
(1) it is included in the stop words list or
(2) it has length smaller than {@value MIN_LENGTH} or
(3) it has length greater than {@value MAX_LENGTH}.

@param word the word to be checked
@return true if the word is irrelevant, false otherwise.
ache/src/main/java/achecrawler/util/string/Stopwords.java