Add todo!() placeholders in body

[c-git]

The code will not be able to compile is this is not done and there is a smaller space to have to click on because the braces will go next to each other after rustfmt {}.

[c-git]

I think for this we could simplify it but simply replacing all "{" with "{ todo!()" instead of trying to target function bodies only. This will mostly hit function bodies only and we can deal with it on a case by case basis where it doesn't work

[c-git]

This has been merged into develop