Move epic private methods from prepended block

Jan Provaznikrequested to merge
jp-epicmodel into master

What does this MR do and why?

Instead of having 'proviate' block in prepended block of Epic model, these methods are moved into 'private' block of the Module. There is no reason to keep these in prepended block and we don't have to add explicit private directive for each newly added private method.

Closes #377214 (closed)

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