style: 代码格式化

src/heurams/kernel/particles/placeholders.py

@@ -1,4 +1,3 @@
-
 from .atom import Atom
 from .electron import Electron
 from .nucleon import Nucleon

src/heurams/kernel/puzzles/guess.py

@@ -1,4 +1,3 @@
-
 from heurams.services.logger import get_logger
 
 from .base import BasePuzzle

src/heurams/kernel/reactor/router.py

@@ -136,7 +136,6 @@ class Router(Machine):
     def __repr__(self, style="pipe", ends="\n"):
         from tabulate import tabulate as tabu
 
-
         lst = [
             {
                 "Type": "Router",