code: static String getQuality(float quality) {
          quality -= 1;
          if (quality == -1) {
              return null;    //Quality missing
          } else {
              String q = Float.toString(quality);
              if (q.endsWith(".0")){
                  return q.substring(0, q.lastIndexOf("."));
              } else {
                  return q;
              }
          }
      }
docs: Decodes the Quality float value.
  
  See {@link VariantToProtoVcfRecord#encodeQuality(String)}
  Decrements one to the quality value.
  0 means missing or unknown, and will return null.
  
  @param quality String quality value
  @return Quality string