Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.1+commit.df193b15.js&optimize=false&runs=200&gist=

ConcatName.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.1;

interface IConcatNameFactory {
    function createConcatName(address concatNameAddress) external returns(address);

}
contract ConcatName {

    bytes public name;
    IConcatNameFactory public factory;

    constructor(bytes memory _name) {
        name = _name;
        factory = IConcatNameFactory(msg.sender);
    }

    function deposit() external payable returns(address){
        return factory.createConcatName(address(this));
    }
}

ConcatNameFactory.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.1;

import "./ConcatName.sol";

contract ConcatNameFactory {
    function createConcatName(address ConcatNameAddress) external returns(address) {
        return address(new ConcatName(abi.encodePacked(ConcatName(ConcatNameAddress).name(), abi.encodePacked("+"))));
    }
}