marketplace with no token

emarket.sol

pragma solidity ^0.5.6;

contract Emarket {

    struct Item {
        string description;
        address seller;
        address buyer;
        uint price;
        bool sold;
    }

    mapping(uint256=>Item) public items;
    uint256 public itemCount;

    function addItem(string memory _description, uint _price) public returns(uint) {
        itemCount++;
        items[itemCount].description = _description;
        items[itemCount].seller = msg.sender;
        items[itemCount].price = _price;
        return itemCount;
    }

    function getItem(uint _index) public view returns(string memory, uint){
        Item storage i = items[_index];
        require(i.seller != address(0), "no such item"); // not exists
        return(i.description, i.price);
    }

    function checkItemExisting(uint _index) public view returns (bool) {
        Item storage i = items[_index];
        return (i.seller != address(0));
    }

    function checkItemSold(uint _index) public view returns (bool) {
        Item storage i = items[_index];
        require(i.seller != address(0), "no such item"); // not exists
        return i.sold;
    }

    function removeItem(uint _index) public {
        Item storage i = items[_index];
        require(i.seller != address(0), "no such item"); // not exists
        require(i.seller == msg.sender, "only seller can remove item");
        require(!i.sold, "item sold already");
        delete items[_index];
    }

    function buyItem(uint _index) public {
        Item storage i = items[_index];
        require(i.seller != address(0), "no such item"); // not exists
        require(!i.sold, "item sold already");
        i.buyer = msg.sender;
        i.sold = true;
    }

}