I need to fill in a multi_dimensional-hash.
currently I use :(just an example)
$cf{$k1}{$k2}{$k3}{"hlst"} ="" if (! defined $cf{$k1}{$k2}{$k3}{"hlst"});
Is there a way to put this in a subroutine and use the
hash_ref and some 'list of keys' to perform this operation
to make it independent of the nbr of keys ?