New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/search/base/text_index/utils.hpp

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "base/checked_cast.hpp"
+
+#include <cstdint>
+
+namespace search_base
+{
+template <typename Sink>
+uint32_t RelativePos(Sink & sink, uint64_t startPos)
+{
+  return base::checked_cast<uint32_t>(sink.Pos() - startPos);
+}
+}  // namespace search_base