The goal of a program is to validate a sudoku game passed to it via the REST interface. Information about sudoku: https://en.wikipedia.org/wiki/Sudoku
- 9x9 grid
- no repeating numbers in a row
- no repeating numbers in a column
- no repeating digit in a 3x3 sub-grid
- empty fields do not invalidate the puzzle. A completely empty board should validate positively.
- Your goal is to extend and modify the project in such a way, that it fulfills the goals described above.
- You're free to extend the interfaces, but please don't remove anything from them
- Please pay attention to comments left in the code.
- Your solution should be tested. Provided are two minimal tests, just for a good start, please keep them green.