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/win.c

@@ -12,6 +12,7 @@
 #include "compton.h"
 #include "c2.h"
 #include "x.h"
+#include "string_utils.h"
 
 #include "win.h"