Write a script that aids refactoring C programs by extracting subroutines from fragments of C code.

Do not reinvent the wheel: wherever possible, use existing technology for the parsing and comprehension of C code. Look at projects such as sparse and Coccinelle.

Your script should work as a filter that puts the free variables at the top, encloses the rest in curly braces, does something helpful with break, continue, and return statements.

That's just a start.

This project is tagged "hard" because it's not clearly specified. The first step (like with many projects) is to work out the specification in more detail.

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