day16 - remove unused function

day16.py

@@ -24,29 +24,6 @@ class Tunnel:
         return str(self)
 
 
-def strip_zero_flow(root: Valve) -> None:
-    q = deque()
-    q.append(root)
-    v = set()
-    while q:
-        valve = q.popleft()
-        if valve.name in v:
-            continue
-        v.add(valve.name)
-        for tunnel in valve.tunnels.copy():
-            if tunnel.target.flowrate > 0:
-                continue
-            q.append(tunnel.target)
-            valve.tunnels.remove(tunnel)
-            for c_tunnel in tunnel.target.tunnels.copy():
-                if c_tunnel.target == valve:
-                    continue
-                elif c_tunnel.target == tunnel.target:
-                    tunnel.target.tunnels.add(Tunnel(valve, tunnel.length + c_tunnel.length))
-                else:
-                    valve.tunnels.add(Tunnel(c_tunnel.target, tunnel.length + c_tunnel.length))
-
-
 def get_openable_valve_tunnels(valve: Valve, open_valves: set, time_remaining: int) -> set:
     tunnels = set()
     queue = deque()