Check if a string conains a specific word

I need to check if an URL address contains some text. so I created this code.

function url_mapping_name( $urlname ) {
    if (str_contains($urlname, 'amazon.de')) {
    echo "amazon;
}
if (str_contains($urlname, 'brickset')) {
    echo 'brickset';
} else {
    echo 'no URL';
}

I am trying to say. Look for "amazon.de" in $urlname, if the URL contains amazon.de return amazon, if the URL contains brickset.com return brickset, if nothing found return no URL

But something is wrong and I do know where I did a mistake

Thanks for helping me.