feat(ast): AST_END type implemented

src/utils/ast/ast_end.c

@@ -0,0 +1,16 @@
+#include "utils/ast/ast_end.h"
+
+#include <stdlib.h>
+#include <assert.h>
+#include <stdbool.h>
+
+bool ast_is_end(struct ast *node)
+{
+    assert(node != NULL);
+    return node->type == AST_END;
+}
+
+struct ast *ast_create_end(end)
+{
+    return ast_create(AST_END, NULL);
+}