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contracts...test.sol

pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Ownership
 * check Ownership of nfts
 */
 
interface deployedContract {
    function totalSupply() external view returns (uint);
    function ownerOf(uint tokenId)external view returns (address);
}
 
contract Storage {
    
    function checkOwnership(address walletAddress, address contractAddress) public returns (uint[] memory){
        // getting total supply of the contract
        uint256 totalSupply = getTotalSupply(contractAddress);
        // initializing an array with the size of the total supply because total supply would be the maximum of it. 
        uint[] memory ids = new uint[](totalSupply);
        // for contracts whose owner is the given address.
        for (uint id = 0; id < totalSupply; totalSupply++) {
            if (walletAddress == deployedContract(contractAddress).ownerOf(id)) {
                ids[id] = id;
            } 
        }
        return ids; 
    }
    
    function getTotalSupply(address contractAddress) internal returns(uint256) {
        return deployedContract(contractAddress).totalSupply();
    }
}