code: def stringify_hash_keys(hash)
        new_hash = {}
        hash.each do |key, value|
          new_hash[key.to_s] =
            if value.is_a? Hash
              stringify_hash_keys value
            else
              value
            end
        end
        new_hash
      end
docs: Stringify symbolized hash keys
   @param [Hash] hash A string/symbol keyed hash
   @return Stringified hash