I'm unsure if this this the right way, when you changed from:
out << saln->partitions[part]->sequence_type << ", ";
to
out << saln->partitions[part]->sequence_type;
why is printing comma removed?

Hi @bqminh ,

I just modified the code so that the comma will be printed out only when both sequence_type and pos are not empty.

if (!saln->partitions[part]->sequence_type.empty() && !pos.empty()) {
       out << ", ";
}