diff -r aeaf7db26fac -r c094afcdfb27 src/ucx/tree.c
--- a/src/ucx/tree.c	Sun Jul 09 15:14:26 2023 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,52 +0,0 @@
-/*
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
- *
- * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *   1. Redistributions of source code must retain the above copyright
- *      notice, this list of conditions and the following disclaimer.
- *
- *   2. Redistributions in binary form must reproduce the above copyright
- *      notice, this list of conditions and the following disclaimer in the
- *      documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "cx/tree.h"
-#include "cx/linked_list.h"
-
-#define CX_TR_PTR(cur, off) *((void**)(((char*)(cur))+(off)))
-
-void cx_tree_add_sibling(void *node, ptrdiff_t loc_prev, ptrdiff_t loc_next, ptrdiff_t loc_parent, void *new_node) {
-    cx_linked_list_add(&node, NULL, loc_prev, loc_next, new_node);
-
-    // optional parent link
-    if (loc_parent >= 0) {
-        CX_TR_PTR(new_node, loc_parent) = CX_TR_PTR(node, loc_parent);
-    }
-}
-
-void cx_tree_add_child(void **children_begin, void **children_end,
-                       ptrdiff_t loc_prev, ptrdiff_t loc_next, void *new_node,
-                       ptrdiff_t loc_parent, void *parent) {
-    cx_linked_list_add(children_begin, children_end, loc_prev, loc_next, new_node);
-
-    // optional parent link
-    if (loc_parent >= 0) {
-        CX_TR_PTR(new_node, loc_parent) = parent;
-    }
-}