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use strict;
use warnings;
...
demo(3);
print "\n";
exit(0);

Perl v5.18.2 on darwin arch darwin-thread-multi-2level
===========
...
s1='Hi Thing One' s2='Hi Thing Two*Bye Thing Two'
Option 3 (opening in >> mode)
s1='Hi Thing One' s2='Hi Thing Two*Bye Thing Two'