'YouTube URL with channel_id vs 'c'

I am writing a PHP script where I am using the YouTube XML URLs as my input

I understood that if the channel has a 'user' like https://www.youtube.com/user/ahodzi24 then its XML URL will be https://www.youtube.com/feeds/videos.xml?user=ahodzi24

And if it has a 'channel' like https://www.youtube.com/channel/UC3lQ8A-4ZJwrq_FnQrEFsqg then its XML URL will be https://www.youtube.com/feeds/videos.xml?channel_id=UC3lQ8A-4ZJwrq_FnQrEFsqg

But I am unable to figure out if the URL doesn't have a channel id and instead has a channel name like this one: https://www.youtube.com/c/ADUAquascaping

Then what should be its XML URL in this case?



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