Rust pop-quiz answer: sorting assets by pnl

#Rust pop-quiz answer to the pop-quiz about sorting assets by pnl.

Sorting assets by pnl becomes easy, once that code it broken out into its own reports-module.

Rust pop-quiz: sort and print CSV-output

#Rust pop-quiz

(yes, another one)

You see the CSV-output is not sorted prettily.

Sort the output alphabetically.

#Traits Bonus

Given comparator function, f: F

Sort the iterable container, c

print_sorted(f: F, c: impl IntoIterator

   where F: FnMut(&T, &T) -> Ordering

this will go into io_utils.rs