Project restructuring to support the new direction

example/c/common.h

@@ -0,0 +1,27 @@
+#ifndef _COMMON_H_
+#define _COMMON_H_
+
+#define SIZE 1024
+#define BROKEN_HEART 1
+#define CONS 2
+#define INTEGER 3
+#define SYMBOL 4
+#define BYE 5
+
+typedef struct box_t {
+  char type;
+  union {
+    int integer;
+    char* symbol;
+    struct cons_t* cons;
+  };
+} box_t;
+
+typedef struct cons_t {
+  box_t car;
+  box_t cdr;
+} cons_t;
+
+extern cons_t *the_empty_list;
+
+#endif // _COMMON_H_