Version 1 have alot of amateurish decision,just think a second then try to write code,v1 repo going to unmanageable project, And I have to choose apply what I learn in this year about manageable projects,unmutable methods with functional programing, and the most important thing write unit Test,
Version 2:I tried to apply what I thought , project codes much more maintainable,and look like much more functional :D But contains strictly Test, But version 2 still going unresolved sudoku examples
My other decision is I have to get some help M.I.T. lesson videos cause my methods cant fill all sudoku boxs, And the lesson videos have a great idea , you dont have to write all possibilties the Puzzle ,just write invariant rules with methods then let the processors to solve puzzle with the huge processing capacity
(.Net Core 2.2 , Console application,C# > 7.2)