Refactor project structure

src/util/log.cpp

@@ -0,0 +1,17 @@
+#include "log.h"
+
+#include <spdlog/cfg/env.h>
+
+void Log::initialize()
+{
+    spdlog::set_pattern("[%H:%M:%S.%e] [%^%l%$] %v");
+
+#ifndef NDEBUG
+    spdlog::set_level(spdlog::level::debug);
+#else
+    spdlog::set_level(spdlog::level::warn);
+#endif
+
+    // Override level when running with environment variable.
+    spdlog::cfg::load_env_levels();
+}