anchor.diff:      <h2>Thank you, enjoy your meal!</h2><br><br>
       Date: ${date.substring(0, date.length-7)}<br>
       Order number: ${session.id}<br>
  -    Total amount: Yen ${formatNumberBy3(session.getAttribute("cart").amount)}<br><br>
  +    Total amount: \$${formatCcy(session.getAttribute("cart").amount)}<br><br>
       <form method="get" action="./GooSushi">
         <input type="submit" name= "thankYouPage" value="come again!">
       </form>
  
positive.code:   // get cart item with the item code
    ShoppingCartItem getCartItem(int itemCode) => _items[itemCode];
  
    // remove an item from the shopping cart and update the amount
    void removeItem(int itemCode) {
      _items.remove(itemCode);
      _grandTotal = 0.0;
      _items.keys.forEach(
          (key){
            _grandTotal = _items[key].subTotal;
          });
    }
  
    // Add an new item and update the amount
    void addItem(ShoppingCartItem newItem) {
      _grandTotal = 0.0;
      _items[newItem.itemCode] = newItem;
      _items.keys.forEach(
          (key){
            _grandTotal += _items[key].subTotal;
          });
    }
  
    // get List of item keys based on itemCodes
  
negative.code:           <th align="center">Quantity</th><th align="center">Subtotal</th>
          </tr>''';
    sb.write(text1);
    int iTotQty = 0;
    cart.sortedItemCodes().forEach((itemCode) {
      ShoppingCartItem cartItem =  cart.items[itemCode];
      var text2 = '''
          <tr><td align="center">${makeSafe(cartItem.itemName)}</td>
          <td align="right">${cartItem.iQty}</td>
          <td align="right">${formatCcy(cartItem.subTotal)}</td></tr>''';
      iTotQty += cartItem.iQty;
      sb.write(text2);
    });
    var text3 = '''<tr><td align="center">Grand Total</td>
          <td align="right">${iTotQty}</td>
          <td align="right" bgcolor="#fafad2">\$${formatCcy(cart.amount)}</td></tr>''';
    sb.write(text3);
    var text4 = '''
        </table><br>
        <input type="submit" name= "confirmPage" value="no, re-order">
        <input type="submit" name= "confirmPage" value=" confirmed ">
      </form><br>
      Order will be cancelled in ${MAX_INACTIVE_SECS} seconds !
    </body>
  </html>''';
     sb.write(text4);
  