sorta kinda working on strings for cmenu. being lazy

cmenu/str.h

@@ -0,0 +1,10 @@
+#include <stddef.h>
+
+typedef struct String {
+	unsigned char const *buffer;
+	size_t size;
+} String;
+
+#define STRING(content) ((String){.buffer=#content, .size=sizeof(#content)-1})
+
+bool StringSub(String string, int start, int end, String *out_substr);