so what you really want to do is strip the last 17 (decimal) bytes (or 18 or 19 depending on your newline) from each line and join on the resultant line ends and spaces?

Also, do you mean to imply that there will be 3 lines (per item) of useful info in the dump, or do you need to deal with a variable (unpredictable) number of lines?

Yes, there's a premium on brevity here, but an even higher premium on precision!