new fs helper module

bsp_q7s/fs/helpers.h

@@ -0,0 +1,15 @@
+#ifndef BSP_Q7S_MEMORY_HELPERS_H_
+#define BSP_Q7S_MEMORY_HELPERS_H_
+
+#include <filesystem>
+
+#include "SdCardManager.h"
+
+namespace fshelpers {
+
+std::filesystem::path buildPrefixedPath(SdCardManager& man,
+                                        std::filesystem::path pathWihtoutPrefix);
+
+}
+
+#endif /* BSP_Q7S_MEMORY_HELPERS_H_ */