diff --git a/.gitignore b/.gitignore
index 2a0b21c..efba7b3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 /connection.py
 /__pycache__
 /nizika_talking.wav
-
+/youtube.py
diff --git a/common_module.py b/common_module.py
new file mode 100644
index 0000000..b052dab
--- /dev/null
+++ b/common_module.py
@@ -0,0 +1,13 @@
+import unicodedata
+
+
+class CommonModule:
+    @staticmethod
+    def is_wide (c: str) -> bool:
+        return unicodedata.east_asian_width (c) in ['F', 'W', 'A']
+
+    @classmethod
+    def string_width_per_pt (cls, string: str) -> float:
+        return sum ([1 if cls.is_wide (c) else .5
+                     for c in string.decode ('utf-8')])
+
diff --git a/main.py b/main.py
index 4b84b04..196b910 100644
--- a/main.py
+++ b/main.py
@@ -8,9 +8,8 @@ from talk import Talk
 import subprocess
 from aques import Aques
 from playsound import playsound
-
-
-YOUTUBE_ID: str = 'Q0kSYNcu5Xk'
+from common_module import CommonModule
+from youtube import *
 
 
 class Main:
diff --git a/youtube.sample.py b/youtube.sample.py
new file mode 100644
index 0000000..1efa8f8
--- /dev/null
+++ b/youtube.sample.py
@@ -0,0 +1,2 @@
+YOUTUBE_ID: str = 'XXXXXXXXXXX'
+