C code provided is already working for playing the sudoku ga

C++:

code provided is already working for playing the sudoku game, you must implement the readBoard() function to properly set up the board for playing from the specified file. You must properly read files in the format given by “sudokuProblem.txt”, with “.” in blank spaces and the “-”, “|” and “+” dividers. If they enter a filename that is not properly formatted, does not exist or is an invalid game, you must not change the current board.

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sudoku.cpp

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Solution

partB