refactor(ast): one file per ast_type -- UNSTABLE (3)

src/utils/ast/ast_void.c

@@ -1 +1,16 @@
 #include "utils/ast/ast_void.h"
+
+#include <stdlib.h>
+#include <assert.h>
+#include <stdbool.h>
+
+bool ast_is_void(struct ast *node)
+{
+    assert(node != NULL);
+    return node->type == AST_VOID;
+}
+
+struct ast *ast_create_void(void)
+{
+    return ast_create(AST_VOID, NULL);
+}