How to prepend single word to each dictionary entry?

[questme]

Thanks for your very fast response! I already found the rule based attack, but it didn't work out. I tried running:
./hashcat-cli64.bin -m 0 -r rule-http-prepend.txt hashes.txt dictionary.txt
where in rule-http-prepend.txt the content is ^h^t^t^p^:^/^/ or the same with a linebreak after every ^h etc. Loads the rule but doesn't find my testhash