I did this problem using javascript and can't seem find the difference:
✘ Failure! You returned:

Lorem ipsum dolor sit amet,
consecteturadipiscing elit.
Aliquamnec consectetur risus.
Crasvel urna a tellus dapibus
consequat.Duis bibendum
tinciduntviverra. Phasellus
dictumefficitur sem quis
porttitor.Mauris luctus
auctordiam id ultrices.
Praesentlaoreet in enim ut
placerat.Praesent a facilisis
turpis.

Expected outpout was:

Lorem ipsum dolor sit amet,
consectetur adipiscing elit.
Aliquam nec consectetur risus.
Cras vel urna a tellus dapibus
consequat. Duis bibendum
tincidunt viverra. Phasellus
dictum efficitur sem quis
porttitor. Mauris luctus
auctor diam id ultrices.
Praesent laoreet in enim ut
placerat. Praesent a facilisis
turpis.

I thought this was an error too but in the prompt it says to ignore spaces before and after.

tried a recursive method and passed the first two tests but got this error on the third test:
RangeError: Maximum call stack size exceeded.

Looks like I reached the maximum call stack because the input was too big.
Will do it by iteration instead!