addtition: slice to array, needs testing

src/arraylist.c

@@ -577,3 +577,29 @@ ArrayListErr arrayslice_advance(ArraySlice *slice, size_t n) {
 
     return ARRLIST_OK;
 }
+
+ArrayList *arrayslice_to_arraylist(const ArraySlice *slice) {
+    if (slice == NULL) {
+        return NULL;
+    }
+
+    if (slice->current >= slice->end) {
+        return NULL;
+    }
+
+    ArrayList *new_arr = arraylist_init(
+        arraylist_capacity(slice->arr),
+        slice->arr->elem_size);
+
+    if (new_arr == NULL) {
+        return NULL;
+    }
+
+    memcpy(
+        new_arr->buffer,
+        slice->arr->buffer + (slice->start * slice->arr->elem_size),
+        slice->arr->elem_size * (slice->end - slice->current)
+    );
+
+    return new_arr;
+}