gistfile1.c

void save_puzzle(unsigned char board[][9])
{
     int i, j, k;
     char path[50];
     clrscr();
     printf("Insert the name of the file you want to save your sudoku puzzle \n");
     scanf("%s", path);
     k = strlen(path);
     FILE *file = fopen(path, "w+");
     if(!file)
     {
         printf("The file you specified could not be opened for writing");
         return;
     }
//apothikeuw  xaraktira xaraktira sto arxeio keimenou kai meta allazw grammi wste na pari ti morfi opws ta arxeia pou mas dwsate px. easy1.sud
     if (path[k] == 'd' && path[k-1] == 'u' && path[k-2] == 's' && path[k-3] == '.') {
         for(i = 0; i < 9; i++)
         {
               for(j = 0; j < 9; j++)
               {
                   fputc('0' + board[i][j], file);       
               }
               fputc('\n', file);
         }
         fclose(file);
         printf("Your sudoku puzzle was succesfully saved in file %s", path);
     }
     else printf("The file name must have a .sud suffix");
}