Sudoku

write a program to help play sudoku games 9x9 array. read in board and commands from a .txt file no classes allowed. functions for check row collumn and subsquare. and functions for add remove characters display board and new board. I have already completed the display board and new board parts N 145369287 629785431 783412569 567148392 938527 14 214936758 851 74623 492853 76 376291845 D R 7 7 A 7 7 9 A 7 4 6 A 8 7 1 A 5 7 6 D N 6892731 921653847 57314 269 154 6972 689271453 742395 81 257834196 19 762538 365 972 D A 9 9 4 A 1 1 4 A 8 3 4 A 1 9 5 A 9 1 8 A 4 5 8 A 6 7 6 A 3 6 8 A 4 1 3 A 9 5 1 D N 2 4 63 421 9 6 42 9 7 6 35 28 7 1 5 59 6 8 857 18 3 5 D A 3 2 4 A 4 1 7 A 8 8 8 A 5 5 5 A 6 9 2 A 3 7 9 A 5 8 9 A 0 4 9 A 3 0 3 A 9 1 0 D A 2 8 5 A 5 9 7 D