Kociemba failed for some cases

[RexWzh]

Thanks for developing this module, it is truly a great resource. I have used it into my own module and while debugging, I came across a few issues that I would like to inquire about. If you are interested, I would be happy to try using some group theory tools to solve this problem ;)

Here is a simple example to reproduce the issue. Note that the two strings refer to the same Rubik's Cube, but with a different view.

import kociemba as kb
good_state = "UUUUUUUUURRRRLRRRRFFFFBFFFFDDDDDDDDDLLLLRLLLLBBBBFBBBB"
bad_state = "UUUUUUUUUFFFFBFFFFLLLLRLLLLDDDDDDDDDBBBBFBBBBRRRRLRRRR"
print(kb.solve(good_state)) # "R L U2 R L' B2 U2 R2 F2 L2 D2 L2 F2"
kb.solve(bad_state)
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
/var/folders/kw/8x7phwld2hdcznypdmdjyc6c0000gn/T/ipykernel_75413/4117867588.py in <module>
----> 1 kb.solve(bad_state)

~/opt/anaconda3/lib/python3.9/site-packages/kociemba/__init__.py in solve(cubestring, patternstring, max_depth)
     59     """
     60 
---> 61     return _solve(cubestring, patternstring, max_depth)
     62 
     63 __all__ = ['solve']

~/opt/anaconda3/lib/python3.9/site-packages/kociemba/__init__.py in _solve(cube, pattern, max_depth)
     16             return ffi.string(res).strip().decode('utf-8')
     17         else:
---> 18             raise ValueError('Error. Probably cubestring is invalid')
     19 except ImportError as e:
     20     print(e)

ValueError: Error. Probably cubestring is invalid

---

Expand code of the two cube strings using tools in rubik_cube.py:

import rubik
state = "UUUUUUUUUFFFFBFFFFLLLLRLLLLDDDDDDDDDBBBBFBBBBRRRRLRRRR"
newstate = "UUUUUUUUURRRRLRRRRFFFFBFFFFDDDDDDDDDLLLLRLLLLBBBBFBBBB"
print(rubik.tools.expand_cube(state))
print(rubik.tools.expand_cube(newstate))
---------------------------------------------------------------------------
          -----
        | U U U |
        | U U U |
        | U U U |
---------------------------------
| B B B | L L L | F F F | R R R |
| B F B | L R L | F B F | R L R |
| B B B | L L L | F F F | R R R |
---------------------------------
        | D D D |
        | D D D |
        | D D D |
          -----

          -----
        | U U U |
        | U U U |
        | U U U |
---------------------------------
| L L L | F F F | R R R | B B B |
| L R L | F B F | R L R | B F B |
| L L L | F F F | R R R | B B B |
---------------------------------
        | D D D |
        | D D D |
        | D D D |
          -----