Mutable borrows: challange

[dankor]

My code doesn't compile after following the video tutorial, am I missing something or is it's a compiler changes?

The code:
https://is.gd/l9IAeS

[oylenshpeegul]

We have to remove the assignment since we're no longer returning anything. That is, if we change

    str1 = join_words(&mut str1, &str2);

to

    join_words(&mut str1, &str2);

then it should work.