Shell script recursive search for directories with spaces in name and renames NOT using rename utility

Question

I have this function that returns any directories that contain spaces:

find_dirs ()
     {
         find "$1" -depth -type d -name '* *' -print
     }

With the following a directory structure:

testdir/A B
testdir/A B/C D
testdir/A B/C D/ef
testdir/nospace

The return when running find_dirs() is:

testdir/A B/C D testdir/A B

At this point I am having issues with how to proceed in splitting out this string to just get the 'A B' 'C D' directories to rename. How can I isolate the 2 paths then isolate just the directories within those paths?