code: protected static List<AtomNode> simpleAtomSegment(char[] charArray, int start, int end)
      {
          List<AtomNode> atomNodeList = new LinkedList<AtomNode>();
          atomNodeList.add(new AtomNode(new String(charArray, start, end - start), CharType.CT_LETTER));
          return atomNodeList;
      }
docs: 简易原子分词，将所有字放到一起作为一个词
  
  @param charArray
  @param start
  @param end
  @return