Function movements

* string functions mstr*() are moved to string_utils.c
* allocation wrappers are moved to utils.h
* printf_* functions are moved to log.h

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/config_libconfig.c

@@ -10,6 +10,7 @@
 
 #include "common.h"
 #include "config.h"
+#include "string_utils.h"
 
 /**
  * Wrapper of libconfig's <code>config_lookup_int</code>.