{   my @possible = ( 'a' .. 'k', 'm', 'n', 'p' .. 'z', 2 .. 9, 'A' .. 'H', 'J' .. 'N', 'P' .. 'Z' );

    sub generatePassword {
        my $length = shift;
        return join '', map $possible[ rand @possible ], 1 .. $length;
        }
    }


{   my $readfile  = 'index.txt';
    my $writefile = 'index.html';

    sub pleaseGodWork {
        my $password = generatePassword 8;
 
        open my $IN, '<', $readfile or die "Cannot open $readfile: $!";
        open my $OUT, '>', $writefile or die "Cannot open $writefile: $!";
        select $OUT;

        s/\Q***password***/$password/g, print while <$IN>;
        }
    }

pleaseGodWork;
exit 0;