sub work_n_save {
    ...  ## whatever
    my $filename = $File::Find::name if !-d;   ## get file name if not directory
    $filename = basename($filename);           ## get the file base name
 ## The line below assumes, files have extention
    $filename =~ s/\..+$//;                    ## remove the file extention
    open my $fh_new, '>', $filename . "_Result" or croak "can't open file: $!";
    open my $fh, '<', $_ or croak "can't open file: $!";
    while ( defined( my $line = <$fh> ) ) {
        chomp $line;
          ## do whatever you want
        print {$fh_new} $line, $/;
    }
}