diff --git a/common_module.py b/common_module.py
index e50bff3..e0f8966 100644
--- a/common_module.py
+++ b/common_module.py
@@ -8,14 +8,13 @@ class CommonModule:
 
     @classmethod
     def len_by_full (cls, string: str) -> float:
-        return sum ([1 if cls.is_wide (c) else .5
-                     for c in string.decode ('utf-8')])
+        return sum ([1 if cls.is_wide (c) else .5 for c in string])
 
     @classmethod
     def index_by_f2c (cls, string: str, index: float) -> int:
         i = 0
         work = ''
-        for c in string.decode ('utf-8'):
+        for c in string:
             work += c
             if cls.len_by_full (work) > index:
                 break