code: def get_multisample_vcf(fnames, name, caller, data):
      
      unique_fnames = []
      for f in fnames:
          if f not in unique_fnames:
              unique_fnames.append(f)
      out_dir = utils.safe_makedir(os.path.join(data["dirs"]["work"], "gemini"))
      if len(unique_fnames) > 1:
          gemini_vcf = os.path.join(out_dir, "%s-%s.vcf.gz" % (name, caller))
          vrn_file_batch = None
          for variant in data.get("variants", []):
              if variant["variantcaller"] == caller and variant.get("vrn_file_batch"):
                  vrn_file_batch = variant["vrn_file_batch"]
          if vrn_file_batch:
              utils.symlink_plus(vrn_file_batch, gemini_vcf)
              return gemini_vcf
          else:
              return vcfutils.merge_variant_files(unique_fnames, gemini_vcf, dd.get_ref_file(data),
                                                  data["config"])
      else:
          gemini_vcf = os.path.join(out_dir, "%s-%s%s" % (name, caller, utils.splitext_plus(unique_fnames[0])[1]))
          utils.symlink_plus(unique_fnames[0], gemini_vcf)
          return gemini_vcf
docs: Retrieve a multiple sample VCF file in a standard location.
  
      Handles inputs with multiple repeated input files from batches.