update main to run tests before solving sudoku1

src/main.c

@@ -15,12 +15,11 @@ int main(int argc, char *argv[])
     printSudoku(9, sudoku1);
     printOnelineSudoku(9, sudoku1);
 
-    solveSudokuBacktracking(9, sudoku1);
+    all_tests();
 
-    printf("Solution:\n");
+    printf("\nSolution:\n");
+    solveSudokuBacktracking(9, sudoku1);
     printSudoku(9, sudoku1);
     printOnelineSudoku(9, sudoku1);
-
-    //all_tests();
     return 0;
 }