addtition: reset and advance, need testing

src/arraylist.c

@@ -553,3 +553,27 @@ ArrayListErr arrayslice_next(ArraySlice *slice, void *out) {
     slice->current++;
     return ARRLIST_OK;
 }
+
+ArrayListErr arrayslice_reset(ArraySlice *slice) {
+    if (slice == NULL) {
+        return ARRLIST_NULL_ARG;
+    }
+
+    slice->current = slice->start;
+
+    return ARRLIST_OK;
+}
+
+ArrayListErr arrayslice_advance(ArraySlice *slice, size_t n) {
+    if (slice == NULL) {
+        return ARRLIST_NULL_ARG;
+    }
+
+    if (n > SIZE_MAX - slice->current || slice->current + n >= slice->end) {
+        return ARRLIST_OUT_OF_BOUNDS;
+    }
+    
+    slice->current += n;
+
+    return ARRLIST_OK;
+}