HMAC SHA256 - Fix 2 errors in library

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Great customer. Thank you.
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Tarea técnica

I have found a supposedly working library here: https://www.mql5.com/en/forum/234164

Unfortunately it's giving 2 errors that I don't know how to fix:

'newKey' - object pointer expected

= - object required

If you can fix I would be very grateful :)

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