Create multiple marsha fns in one file with no imports

[Alejandro Guillen]

This will require rewriting the imports since they will refer to files that no longer exist, if we make it a patch after-the-fact. Alternatively it will require telling ChatGPT what the filename will be so it writes it correctly the first time (but this has the added complexity of errors in a function not being edited possibly triggering issues in the currently-being-developed function because we can't easily run just the test suite for the current function).