code: public static String getVariantKey(Map<String, String> variants) {
  
  		String variantKey = "";
  		if (variants != null) {
  			variantKey = getVariantKey(variants, variants.keySet());
  		}
  
  		return variantKey;
  	}
docs: Returns the variant key from the variants given in parameter
  
  @param variants
  the variants
  @return the variant key