printf qq{'$_' } for @digits;
The correct format for printf is printf FORMAT_STRING, LIST so that should be:
printf q{'%s' }, $_ for @digits;
But you don't really need the extra overhead of using printf:
print qq{'$_' } for @digits;
But that wouldn't work properly because of your use of the -l switch which will add a newline after every print.
Of course you could do something like this:
print join ' ', map "'$_'", @digits;
Which also avoids the extra space character at the end of the line.
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