code: function make_clean_topic(tokens) {
  	return tokens.map(function (token) {
  		if (token.type === "raw") return token.piece.slice(0, -1);
  		else if (token.type === "single") return "+";
  		else if (token.type === "multi") return "#";
  		else return ""; // Wat
  	}).join("/");
  }
docs: Turn a topic pattern into a regular MQTT topic