The International Component for Unicode (ICU) library can save you from being hopelessly mired in numerous character encodings as your C/C++ application matures into internationalization and localization.
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Learn about UTF-8 encoding of UNICODE characters.
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Adding multilanguage support to your application
Multilingual Applications - Switching Languages
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Learn to implement exception handling mechanism in C++.
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With .NET Standard, you only have to master one platform, which will be able to run on all .NET platforms.
It's good practice to use code metrics to validate code; it will improve code quality and make your application maintainable and less complex.