In your initial post..

I assume that the 'data' is a sample of the file content, but the data does NOT have a line that contains 'show running-config'. So looping through the data will do nothing, which will account for a number for errors.

Your 2nd 'code' posting seems to be unrelated to the first.

Perhaps it's time to take a step backward and more clearly define what it is you are trying to accomplish.

sudo-code...
Parse data and sort into a data structure.
Data structure to be: ????
Print (show desired output).
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