created why2_list_remove_at in llist

removes element by index

include/llist.h

@@ -42,6 +42,7 @@ typedef struct
 void why2_list_push(why2_list_t *list, void *value, unsigned long size); //PUSH ELEMENT TO LIST BACK
 void why2_list_push_at(why2_list_t *list, unsigned long index, void *value, unsigned long size); //PUSH ELEMENT TO INDEX index of LIST
 void why2_list_remove(why2_list_t *list, why2_node_t *node); //REMOVE ELEMENT
+void why2_list_remove_at(why2_list_t *list, unsigned long index); //REMOVE ELEMENT WITH INDEX index
 void why2_list_remove_back(why2_list_t *list); //REMOVE LAST ELEMENT
 why2_node_t *why2_list_find(why2_list_t *list, void *value); //FIND ELEMENT IN LIST
 unsigned long why2_list_get_size(why2_list_t *list); //GET SIZE

src/core/lib/utils/llist.c

@@ -117,6 +117,29 @@ void why2_list_remove(why2_list_t *list, why2_node_t *node)
     why2_deallocate(node);
 }
 
+void why2_list_remove_at(why2_list_t *list, unsigned long index)
+{
+    if (list == NULL) return; //EMPTY LIST
+
+    why2_node_t *node_to_remove;
+
+    if (index != 0) //SHOULDN'T BE FIRST
+    {
+        why2_node_t *node_before = list -> head;
+        for (unsigned long j = 0; j < index - 1; j++) node_before = node_before -> next; //SCROLL TO THE POSITION
+
+        node_to_remove = node_before -> next;
+        node_before -> next = node_to_remove -> next;
+    } else //ADD BEFORE THE WHOLE LIST
+    {
+        node_to_remove = list -> head;
+        list -> head = node_to_remove -> next;
+    }
+
+    why2_deallocate(node_to_remove -> value);
+    why2_deallocate(node_to_remove);
+}
+
 void why2_list_remove_back(why2_list_t *list)
 {
     why2_node_t *head = list -> head;