worked on FAT stuff and tests

ext/sd/fat32/Helper.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <string>
+#include <algorithm>
+
+static char asciitolower(char in) {
+	if (in <= 'Z' && in >= 'A') {return in - ('Z' - 'z');}
+	return in;
+}
+
+static void toLower(std::string& str) {
+	std::transform(str.begin(), str.end(), str.begin(), asciitolower);
+}