correction in the add method of Text.java

src/Text.java

@@ -35,7 +35,7 @@ public class Text {
      */
     public boolean add(int paragraphNumber, String newText) {
         if (paragraphExists(paragraphNumber)) {
-            text.add((paragraphNumber - 1), newText);
+            text.add((paragraphNumber - 1), newText.replaceAll("[^A-Za-z0-9 .,:?!\"'-]", ""));
             return true;
         }
         return false;
@@ -164,7 +164,7 @@ public class Text {
     /**
      * This method counts all words in text and adds the count together with the paragraph where the word has been used to a Hashmap.
      *
-     * @param wordbook
+     * @param wordbook the HashMap Object which should be edited
      */
     private void createWordlist(HashMap<String, ArrayList<Integer>> wordbook) {
         ArrayList<Integer> numbersList;