Add lots of utilties, initial builtins

src/evaluate.c

@@ -0,0 +1,29 @@
+#include <assert.h>
+#include <stddef.h>
+
+#include "nihilispm.h"
+
+struct nl_object *nl_evaluate_list(struct nl_object *list) {
+    return NULL;
+}
+
+struct nl_object *nl_evaluate_symbol(struct nl_object *symbol) {
+    return NULL;
+}
+
+struct nl_object *nl_evaluate(struct nl_object *obj) {
+    assert(obj != NULL);
+
+    switch (obj->type) {
+        case NL_TYPE_CELL:
+            return nl_evaluate_list(obj);
+        case NL_TYPE_SYMBOL:
+            return NULL; //nl_evalute_symbol(obj);
+        case NL_TYPE_INT:
+        case NL_TYPE_STRING:
+            return obj;
+        case NL_TYPE_COUNT:
+            assert(0);
+            return NULL;
+    }
+}