question: private static Cell [ ] interpret ( String string ) { Cell [ ] cells = new Cell [ 9 ] ; for ( int i = 0 ; i < string . length ( ) ; i ++ ) { int dig = string . charAt ( i ) - '1' ; int col = dig % 3 ; int row = dig / 3 ; cells [ i ] = new Cell ( col , row ) ; } return cells ; }
target:  Interpret string of digits into Cells. 