$string .= '"';
# or
substr $string, length $string, 0, '"';
# or
$string =~ s/$/"/;


##</code><code>##

$string .= '"' if ($string =~ tr/"//) % 2;


##</code><code>##

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,