Implement storedevs, prepare to port littlefs

kernel/util/util.c

@@ -0,0 +1,15 @@
+#include "util.h"
+
+char *util_get_filename(char *path) {
+  char *lastslash = path;
+  char *p = path;
+
+  while (*p) {
+    if (*p == '/') {
+      lastslash = p + 1;
+    }
+    p++;
+  }
+  return lastslash;
+}
+