docs: public static void writeString(String string, ByteBuffer buffer) throws IOException {
          if (string == null) {
              buffer.putInt(VoltType.NULL_STRING_LENGTH);
              return;
          }
  
          byte[] strbytes = string.getBytes(Constants.UTF8ENCODING);
          int len = strbytes.length;
  
          buffer.putInt(len);
          buffer.put(strbytes);
      }