Your indenting and placement of curly brackets is somewhat inconsistent and, in places, misleading, but...

As best I can see at quick glance, your code consists of three subroutines. sub main calls find_copy_rename and create_text_file. But sub main itself is never called.

Perhaps you thought "main" would fire automatically. That is not the case in Perl.

Also, I would encourage you to call your subroutines with sub_name() rather than &sub_name. The latter form exposes @_ from the calling context in a way that could cause you confusion inside your sub.

Hope that helps.

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"Perl is a mess and that's good because the
problem space is also a mess." - Larry Wall