[Logic] Basic command analysis

[Yurand2000]

Create a function which takes an atomic command r and a post-condition q and returns the weakest precondition p that makes the SSIL triple {{p}} r {{q}} valid. This function will be used in the analysis of atomic commands inside blocks, while other structures will be used for the analysis of the regular commands C+C and C*.

[Yurand2000]

TO DO:

• [ ] Implement analysis for Heap Atomic Commands
• [ ] Add more tests