code: def finalize_vcf(in_file, variantcaller, items):
      
      out_file = "%s-annotated%s" % utils.splitext_plus(in_file)
      if not utils.file_uptodate(out_file, in_file):
          header_cl = _add_vcf_header_sample_cl(in_file, items, out_file)
          contig_cl = _add_contig_cl(in_file, items, out_file)
          cls = [x for x in (contig_cl, header_cl) if x]
          if cls:
              post_cl = " | ".join(cls) + " | "
          else:
              post_cl = None
          dbsnp_file = tz.get_in(("genome_resources", "variation", "dbsnp"), items[0])
          if dbsnp_file:
              out_file = _add_dbsnp(in_file, dbsnp_file, items[0], out_file, post_cl)
      if utils.file_exists(out_file):
          return vcfutils.bgzip_and_index(out_file, items[0]["config"])
      else:
          return in_file
docs: Perform cleanup and dbSNP annotation of the final VCF.
  
      - Adds contigs to header for bcftools compatibility
      - adds sample information for tumor/normal