```\nfunction changeBaseURI(string memory newBaseURI)\n    public\n    onlyOwner\n    notLocked\n{\n    require((keccak256(abi.encodePacked((_baseTokenURI))) != keccak256(abi.encodePacked((newBaseURI)))), "DCBW721: Base URI cannot be same as previous");\n    _baseTokenURI = newBaseURI;\n}\n```\n