Docs: Add type hinting to return of a*

src/a_star.py

@@ -46,7 +46,7 @@ def is_empty(self):
         """ Checks if the frontier is empty """
         return len(self.frontier) == 0
 
-def a_star(map: Map, start_pos: list[int, int]=None, goal_pos: list[int, int]=None):
+def a_star(map: Map, start_pos: list[int, int]=None, goal_pos: list[int, int]=None) -> list[list[int, int]]:
     """
     A* algorithm implementation
 
@@ -143,4 +143,4 @@ def a_star_heuristic(current_pos: list[int, int], goal_pos: list[int, int]) -> f
     x_distance = abs(current_pos[0] - goal_pos[0])
     y_distance = abs(current_pos[1] - goal_pos[1])
     return x_distance + y_distance
-
+