package Skywalker;
require Exporter;
@ISA = qw(Exporter);

use strict;

our @EXPORT = qw(ReadConfig);

sub ReadConfig {
    my ($file) = shift;
    warn " --- going to read config file: $file ---\n";
    # more steps here
}

1;

##</code><code>##

#!/usr/bin/perl
use warnings;
use strict;
use Skywalker;

ReadConfig('/tmp/simple.cfg');

##</code><code>##

perl walktest.pl 
 --- going to read config file: /tmp/simple.cfg ---