#!/usr/bin/perl

# http://perlmonks.org/?node_id=1133857

use warnings;
use strict;

print zip("ABCDEFGHIJ", "abcde"), "\n";

sub zip
  {
  my ($str1, $str2) = @_;
  my $len = length $str2;
  pack("(ax)$len (a)*", split //, $str1) | pack "(xa)$len", split //, $str2
  }