Restructured code

test/test_solver.py

@@ -2,7 +2,7 @@
 import unittest
 import copy
 
-from shenzhen_solitaire import solver
+from shenzhen_solitaire.solver import solver
 
 from .boards import TEST_BOARD
 
@@ -13,7 +13,7 @@ class SolverTest(unittest.TestCase):
     def test_solver(self) -> None:
         """Tests solver"""
         board_copy = copy.deepcopy(TEST_BOARD)
-        board_id = TEST_BOARD.state_identifier  # type: ignore
+        board_id = TEST_BOARD.state_identifier
         board_solution_iterator = solver.solve(TEST_BOARD)
         for _, current_solution in zip(range(1), board_solution_iterator):
             self.assertEqual(board_id, board_copy.state_identifier)