More readability and improve codegeneration by compiler

[GermanAizek]

I think it will be useful both for compiler and more readable to create separate variable with short name and reuse it.

[johnmach]

Hi @GermanAizek,

Thank you for highlighting your interest in Gmmlib.
We appreciate your suggestions and we will plan to accommodate this change as well as other PRs you recommended. We will have an internal review and decide on the best possible way to help address your recommendation.