private function fillSource($source, $photo): string
    {
        if (! empty($source)) {
            return $this->filterUriInstance($source);
        }

        return (string) $photo;
    }
private function fillSource($source, $photo): string
    {
        if (! empty($source)) {
            return $this->filterUriInstance($source);
        }

        return (string) $photo;
    }
private function fillSource ( $ source , $ photo ) : string { if ( ! empty ( $ source ) ) { return $ this -> filterUriInstance ( $ source ) ; } return ( string ) $ photo ; }
source taken from photo url if not available

@param \Psr\Http\Message\UriInterface|string $source
@param \Psr\Http\Message\UriInterface|string $photo
source taken from photo url if not available