function listDapp (string _itemName, string _itemDesc, string _itemURL) public {
    require(bytes(_itemName).length > 2);
    require(bytes(_itemDesc).length > 2);
    require(bytes(_itemURL).length > 2);
    
    uint256 _itemId = itemIdCounter;
    itemIdCounter = itemIdCounter + 1;

    ownerOfItem[_itemId] = msg.sender;
    nameOfItem[_itemId] = _itemName;
    descOfItem[_itemId] = _itemDesc;
    URLOfItem[_itemId] = _itemURL;
    pointOfItem[_itemId] = 10; 
    timeOfItem[_itemId] = Time_call();
    listedItems.push(_itemId);
    
    pointArrayOfArray[_itemId].push(10);
    timeArrayOfArray[_itemId].push(Time_call());
  }