Implement Mutable Arithmetics

[codecov-commenter]

Codecov Report

Base: 75.27% // Head: 72.01% // Decreases project coverage by -3.25% :warning:

Coverage data is based on head (9f14edf) compared to base (ff7488c). Patch coverage: 34.06% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## px/refactor #57 +/- ## =============================================== - Coverage 75.27% 72.01% -3.26% =============================================== Files 19 19 Lines 1007 1097 +90 =============================================== + Hits 758 790 +32 - Misses 249 307 +58 ``` | [Impacted Files](https://codecov.io/gh/psrenergy/ToQUBO.jl/pull/57?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=psrenergy) | Coverage Δ | | |---|---|---| | [src/lib/pbo/PBF.jl](https://codecov.io/gh/psrenergy/ToQUBO.jl/pull/57/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=psrenergy#diff-c3JjL2xpYi9wYm8vUEJGLmps) | `67.18% <33.33%> (-17.15%)` | :arrow_down: | | [src/compiler/build.jl](https://codecov.io/gh/psrenergy/ToQUBO.jl/pull/57/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=psrenergy#diff-c3JjL2NvbXBpbGVyL2J1aWxkLmps) | `95.23% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=psrenergy). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=psrenergy)

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