use strict;
use warnings;

my @stuff = 1..5;

for my $s (@stuff) {
    next if is_bad_stuff($s);

    my $formatted = format_stuff($s);
    print "$formatted: passed\n";
}

sub is_bad_stuff { 
    my ( $s ) = @_;
    
    return $s == 3;
}

sub format_stuff {
    my ( $s ) = @_;

    $s = '<UNDEF>' 
    return "Formatted $s";
}