code: def make_vslc_label(self, gene_label, allele1_label, allele2_label):
          
  
          vslc_label = ''
  
          if gene_label is None and allele1_label is None and allele2_label is None:
              LOG.error("Not enough info to make vslc label")
              return None
  
          top = self.make_variant_locus_label(gene_label, allele1_label)
          bottom = ''
          if allele2_label is not None:
              bottom = self.make_variant_locus_label(gene_label, allele2_label)
  
          vslc_label = '/'.join((top, bottom))
  
          return vslc_label
docs: Make a Variant Single Locus Complement (VSLC) in monarch-style.
          :param gene_label:
          :param allele1_label:
          :param allele2_label:
          :return: