Beautified code and added Normalized word functionality on OneWords

src/main/java/alg/XML_processing.java

@@ -892,7 +892,7 @@ public class XML_processing {
 		if (filter.getAl() == AnalysisLevel.STRING_LEVEL) {
 			// ngram level: if not 0 must be less than or equal to number of words in this sentence.
 			if (filter.getNgramValue() > 0 && filter.getNgramValue() > sentence.size()) {
-				return null;
+				return new ArrayList<>();
 			}
 
 			// if we're calculating values for letters, omit words that are shorter than string length

src/main/java/alg/ngram/Ngrams.java

@@ -56,7 +56,8 @@ public class Ngrams {
 //					String test = key;
 //				}
 
-//				key = (!key.equals("") && key.charAt(key.length()-1) == ',') ? key.substring(0, key.length() - 1) : key;
+				if (stats.getFilter().getNotePunctuations())
+					key = (!key.equals("") && key.charAt(key.length()-1) == ',') ? key.substring(0, key.length() - 1) : key;
 
 				MultipleHMKeys multipleKeys;
 
@@ -165,6 +166,12 @@ public class Ngrams {
 //						.collect(Collectors.toList()));
 //				.substring(0, 1)
 				return StringUtils.join(candidate, " ");
+			case NORMALIZED_WORD:
+				candidate.addAll(ngramCandidate
+						.stream()
+						.map(Word::getNormalizedWord)
+						.collect(Collectors.toList()));
+				return StringUtils.join(candidate, " ");
 		}
 
 		return StringUtils.join(candidate, " ");