Rejected the translation by mistake :-(

Here is a new fork, including an updated (language-indipendent) description.

I'm experiencing the same in Java 17; Error message mentions that the first component should have brackets in between the tags that ecapsulates the remainding output,

ex) <...le="color: orange">9[715FR329...].

the output examples states: RoboScript.highlight("FFFR345F2LL"); // => "<span style="color: pink">FFF<span style="color: green">R<span style="color: orange">345<span style="color: pink">F<span style="color: orange">2<span style="color: red">LL"

notice there are no brackets.

Ranks can't be changed

There is an open issue below about the same, please don't open another. Closing.

Instructions are unclear, needed to use the comments to figure out what to do

there is only one vowel in 'string'. str shadows the builtin function str(), string shadows the string module, people are gonna complain with either of these

BRU

Bruh!

bruh

#FreeTomFoolery

bruh

.

Either your function or the control function is returning None it seems. Print the input and try to debug your code.