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sub add_zero { $x = shift; return $x if ( $x > 9 ); return ( '0' . $x 
+) if ( $x < 10 ); }

sub pad
{
...
    return $n if $n =~ /\D/;
    return $n > 9 ? $n : "0$n";
}

$n = $n =~ /^\d/ ? sprintf('%02d', $n) : $n;