Sort merged cells

Hello experts
I need to sort column C which has merged cells ...
I have searched and found a piece of code but it gives me error (the merged cells would be the same size)
Thanks advanced for help

Try next code

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Thank you very much Mr. PCI for this great solution
You are great
During the wait period I have tried and succeeded to do the task with the following code (but of course your code is greater and more wonderful)

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