Here is the code where i tried to rename the contents of the file by mathcing with text file using perl?

Am facing with this part of code especially change file,rename file and write file subroutine

sub rename_dirs {
    my ( $top_dir, $name_map, $regex ) = @_;
    
    opendir (my $dh, $top_dir) or die "Can't open $top_dir: $!";
    my $save_dir = getcwd();
    chdir $top_dir;
    while (my $name = readdir $dh) {

        next if ($name eq '.') or ($name eq '..'); 
        if ( ( -d $name ) && ( exists $name_map->{$name} ) ) {
            print $name;
            my $new_name = $name_map->{$name};
            #print $new_name;
            rename_file_or_dir( $name, $new_name );
            $name = $new_name;
            
            #print $name;
        }
        elsif ( -f $name ) {
            if (( my $base_name = $name) =~ s/\.config$// ) {
                if ( $name_map->{$base_name} ) {
                    my $new_name = $name_map->{$base_name} . '.config'
+;
                  #  print $new_name;
                    rename_file_or_dir( $name, $new_name );
                    change_file( $new_name, $name_map, $regex );
                }
            }
        }
        rename_dirs( $name, $name_map, $regex ) if -d $name;
    }
    chdir $save_dir;
}

sub change_file {
    my ( $fn, $map, $regex ) = @_;
   # print $fn;

    open ( my $fh, '<', $fn ) or die "Could not open file '$fn': $!";
    my $str = do { local $/; <$fh> };
    print $str;
    close $fh;
    my $num_replacements = $str =~ s/($regex)/$map->{$1}/ge;

    if ( $num_replacements ) {
        write_new_file( $fn, \$str );
    }
}

sub write_new_file {
    my ( $fn, $str ) = @_;

    open ( my $fh, '>', $fn ) or die "Could not open file '$fn': $!";
    print $fh $str;
    close $fh;
}

sub rename_file_or_dir {
    my ( $name, $new_name ) = @_;
    File::Copy::move( $name, $new_name )
        or die "Could not rename '$name' as '$new_name': $!";
}

sub read_map {
    my ( $fn ) = @_;

    my %name_map;

    open( my $fh, '<', $fn ) or die "Could not open file '$fn': $!";
    while( my $line = <$fh> ) {
        chomp $line;
        my @fields = split /:/, $line;
       # print @fields;
        if ( @fields == 3 ) {
            $name_map{$fields[2]} = $fields[1];
        }
    }
    close $fh;
    return \%name_map;
}
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