Iterating over buffer lines

[Joshua Lambert <jlambert.lis.tech@gmail.com>]

I have created some functions that make changes to one buffer line of
a csv file. Let's call those functions a, b and c. Each of those take
one or more arguments. I want to create a separate interactive
function that does what function a, b, and c do, but on every line of
the region. I successfully created a function (act-on-region-by-line)
to go through all lines in a region and then call function a, function
b, or function c. But, It seems redundant to have multiple functions
that have 9-15 lines similar and one line different, the one that
specifies function a, b or c. What is the best way to be efficient in
this situation?

I have attempted to pass function b as a parameter, but I am slow to
understand how to do that. Is that the best way, or is there another?

Thanks,
J Lambert