Rewrite existing code in C

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Job Description

I have a finished project. all little details are done. I want to reformat the code so it cant be with same logic but still do the same.
Beyond change variables, change pointers and grouping code into functions and ungroup functions, I want the code to be changed so it can't be recognized again as a copy. I want that the would do the same but with different logic strategies.
I want about 70% of code to be changed.
All code described to be changed is at \Code dir.
All code regard Cplex is not to be touched.
* note -> we have tests for the code, the given job must pass these tests.

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