Fix the coordinate fetching

app.py

@@ -23,7 +23,7 @@ def sunrise_sunset_tool(city:str)-> str: #it's import to specify the return type
         city: A string representing location name
     """
     try:
-        lat, lng = get_city_coordinates()
+        lat, lng = get_city_coordinates(city)
         api_url = "https://api.sunrise-sunset.org/json"
         payload = {'lat': lat, 'lng': lng}
         ret = requests.get(api_url, params=payload)