Relating to the heuristic search (dfs, A*) it is a sokoban puzzle (robot pushes

Relating to the heuristic search (dfs, A*) it is a sokoban puzzle (robot pushes

Relating to the heuristic search (dfs, A*) it is a sokoban puzzle (robot pushes boxes to storages)
I had completed some of the parts, but have no idea why not pass most of the tests. I suspect the get_successor function causes most of the issue, but don’t know how to fix it. Need someone fix my code and pass all the test. can only modify solve.py, DON’T MODIFY board.py. (the image is what i got for now in my code)