comments, use Nothing instead of voidptr

src/include/nothing.h

@@ -0,0 +1,10 @@
+// nothing.h - ever needed to return nothing (but not void)?
+// boy do I have the solution for you
+
+#ifndef NOTHING_H
+#define NOTHING_H
+
+// Behold, it is nothing!
+typedef struct Nothing {} Nothing;
+
+#endif