+char* time_stamp(void);
+
+// #define LOG_I(...) {printf("[%s]", time_stamp()); printf(__VA_ARGS__); printf("\n");}
+// #define LOG_E(...) {printf("[%s]", time_stamp()); printf(__VA_ARGS__); printf("\n");}
+// #define LOG_D(...) {printf("[%s]", time_stamp()); printf(__VA_ARGS__); printf("\n");}
+