Refactor neighbourhood exploration

src/processing.py

@@ -82,11 +82,14 @@ def get_random_solution(previous, data):
 
 
 def explore_neighbourhood(element, data, max_iterations=100000):
-    neighbour = DataFrame()
+    neighbourhood = []
+    neighbourhood.append(element)
     for _ in range(max_iterations):
-        neighbour, stop_condition = get_random_solution(element, data)
-        if stop_condition:
+        previous_solution = neighbourhood[-1]
+        neighbour = get_random_solution(previous=previous_solution, data=data)
+        if neighbour.equals(previous_solution):
             break
+        neighbourhood.append(neighbour)
     return neighbour