layout source from main

src/util/id_util.hpp

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <string>
+
+namespace lm {
+
+class IdUtil
+{
+public:
+  static std::string newId();
+  static std::string nowIso8601();
+};
+
+}  // namespace lm