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sub normalise{
    my $network_device_polling_data = shift;
...
    ...;
    return $network_device_polling_data;
}

sub normalise_network_device_polling_data {
    my $data = shift;
...
    ...;
    return $data;
}

sub normalise_network_device_polling_data {
    die "This is a procedure not a function" if defined wantarray;
...
        $_ = quotemeta;
    }
}