it would be useful to add some more context to the errors using fmt.Errorf("error while doing this thing for this other thing: %w", err)

@gagliardetto added. Any other feedback?

After the changes, please try out the new split command on a car file (early epochs should be good size).

After that, use faithful-cli dump-car /path/to/split-123.car on each split piece. It should print everything without errors.

$ yellowstone-faithful split-car -e 0 -s 1000000000 ./epoch-0.car

split it into the following 5 files:

$ ls -l *car
-rw-r--r--  1 anjor  staff  1004138599 Jul  8 11:16 epoch-0-1.car
-rw-r--r--  1 anjor  staff  1004146286 Jul  8 11:17 epoch-0-2.car
-rw-r--r--  1 anjor  staff  1004146195 Jul  8 11:17 epoch-0-3.car
-rw-r--r--  1 anjor  staff  1004145672 Jul  8 11:18 epoch-0-4.car
-rw-r--r--  1 anjor  staff   269251520 Jul  8 11:18 epoch-0-5.car
-rw-r--r--@ 1 anjor  staff  4286945461 Jul  8 11:09 epoch-0.car

dump-car didn't throw any errors. Just printed out a bunch of stuff.

LGTM