refactoring
10 strikes + 2 bouns strikes, all tests passed
10 pairs of 5 and spare + bonus 5, all tests passed
10 pairs of 9 and miss, all tests passed
5 pairs of strike and spair + bonus 5, all tests passed
9 frames of gutter, 10th frame spare + bonus roll, all passed
9 frames of gutter, 10th frame strike + 2 bonus rolls: strike
9 frames of gutter, 10th frame strike + 2 bonus rolls: spare