First commit, fixed appending, create, destroy and get, all working fine

include/linkedlist.h

@@ -0,0 +1,26 @@
+#ifndef LINKEDLIST_H
+#define LINKEDLIST_H
+
+#include <stdlib.h>
+
+typedef struct LinkedList LinkedList;
+
+typedef enum {
+    LLIST_OK = 0,
+    LLIST_ALLOC,
+    LLIST_NULL,
+    LLIST_NULL_ARG,
+    LLIST_OUT_OF_BOUNDS,
+    LLIST_INVALID_SIZE,
+} LinkedListErr;
+
+LinkedListErr linkedlist_create(LinkedList **out, size_t elem_size);
+LinkedListErr linkedlist_destroy(LinkedList *ll);
+
+LinkedListErr linkedlist_append(LinkedList *ll, void *data);
+LinkedListErr linkedlist_delete(LinkedList *ll, size_t index);
+LinkedListErr linkedlist_pop(LinkedList *ll, size_t index, void *out);
+LinkedListErr linkedlist_insert(LinkedList *ll, size_t index, void *out);
+LinkedListErr linkedlist_get(const LinkedList *ll, size_t index, void *out);
+
+#endif /* ifndef LINKEDLIST_H */