diff -r 9d4971ea0625 -r cd3069757010 src/linked_list.c
--- a/src/linked_list.c	Mon Sep 27 17:49:23 2021 +0200
+++ b/src/linked_list.c	Mon Sep 27 18:33:30 2021 +0200
@@ -34,6 +34,16 @@
 
 #define CX_LL_PTR(cur, off) ((void**)(((char*)cur)+off))
 
+void *cx_linked_list_at(void *start, size_t start_index, ptrdiff_t loc_advance, size_t index) {
+    size_t i = start_index;
+    void* cur = start;
+    while (i != index && cur != NULL) {
+        cur = *CX_LL_PTR(cur, loc_advance);
+        i < index ? i++ : i--;
+    }
+    return cur;
+}
+
 void *cx_linked_list_last(void **begin, void **end, ptrdiff_t loc_next) {
     if (end != NULL) {
         return *end;
@@ -97,7 +107,7 @@
     ptrdiff_t loc_next;
 } cx_linked_list;
 
-int cx_ll_add(cx_list_s *list, void *elem) {
+static int cx_ll_add(cx_list_s *list, void *elem) {
     cx_linked_list *ll = (cx_linked_list *) list;
 
     struct cx_linked_list_node *node = cxMalloc(list->allocator,
@@ -122,19 +132,22 @@
     }
 }
 
-int cx_ll_insert(cx_list_s *list, size_t index, void *elem) {
+static int cx_ll_insert(cx_list_s *list, size_t index, void *elem) {
     cx_linked_list *ll = (cx_linked_list *) list;
     // TODO: implement using low level API
     return 1;
 }
 
-void *cx_ll_remove(cx_list_s *list, size_t index) {
+static int cx_ll_remove(cx_list_s *list, size_t index) {
+    if (index >= list->size) {
+        return 1;
+    }
     cx_linked_list *ll = (cx_linked_list *) list;
     // TODO: implement using low level API
-    return NULL;
+    return 0;
 }
 
-size_t cx_ll_find(cx_list_s *list, void *elem) {
+static size_t cx_ll_find(cx_list_s *list, void *elem) {
     CxListComparator cmp = list->cmpfunc;
     cx_linked_list *ll = (cx_linked_list *) list;
 
@@ -150,7 +163,7 @@
     return index;
 }
 
-void *cx_ll_last(cx_list_s *list) {
+static void *cx_ll_last(cx_list_s *list) {
     cx_linked_list *linkedList = (cx_linked_list *) list;
     struct cx_linked_list_node *last = cx_linked_list_last(
             NULL, &linkedList->end, offsetof(struct cx_linked_list_node, next));