private List<String> readLines(InputStream fileStream) throws IOException {
        if(fileStream == null) {
            throw new IllegalArgumentException("Input stream can't be null");
        }
        List<String> lines = new ArrayList<>();
        try (BufferedReader in = new BufferedReader(new InputStreamReader(fileStream)) ) {
            for (String temp = in.readLine(); temp != null; temp = in.readLine()) {
                lines.add(temp);
            }
        }
        return lines;
    }
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