Maybe now you can tell us what exactly the problem is?

What language is the source code you have in? What steps have you already taken to translate it to Perl 5? Where exactly are you having problems?

Are your problems with the syntax? Are your problems with understanding what the program does in its original form?

Maybe you just need to run the program using the Perl 6 / Raku / Rakudo interpreter instead of the Perl 5 interpreter?