Add new resource to the NFT

addResourceEntry.sol

pragma solidity ^0.8.15;

function addResourceEntry(string memory metadataURI)
    external
    onlyOwnerOrContributor
{
    unchecked {
        _totalResources += 1;
    }
    _addResourceEntry(uint64(_totalResources), metadataURI);
}

function _addResourceEntry(uint64 id, string memory metadataURI) internal {
    if (id == uint64(0)) revert RMRKWriteToZero();
    if (bytes(_resources[id]).length > 0)
        revert RMRKResourceAlreadyExists();
    _resources[id] = metadataURI;
    _allResources.push(id);

    emit ResourceSet(id);
}