:art: check string exists

diff --git a/util b/util
index a593fd9a4a13dd5aa0b40c338629f721eccee182..c45192ded4f6f23343555665ac01d8eabcc748a4 160000 (submodule)
--- a/util
+++ b/util
@@ -1 +1 @@
-Subproject commit a593fd9a4a13dd5aa0b40c338629f721eccee182
+Subproject commit c45192ded4f6f23343555665ac01d8eabcc748a4