restructure project

ixcrypto/ixcrypto/IXBase64.h

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+/*
+ *  base64.h
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2018 Machine Zone. All rights reserved.
+ */
+
+#pragma once
+
+#include <string>
+
+namespace ix
+{
+    std::string base64_encode(const std::string& data, size_t len);
+    std::string base64_decode(const std::string& encoded_string);
+} // namespace ix