Update 'exercices/ex.4/win_create.bat'

exercices/ex.4/win_create.bat

@@ -4,7 +4,7 @@ SET SOME_VAR="first.txt"
 DEL /S "%SOME_VAR%" || echo "file not found"
 SET SOME_VAR="second.txt"
 DEL /S "%SOME_VAR%" || echo "file not found"
-rem CALL :_ex
+CALL :_ex
 
 EXIT /B %ERRORLEVEL%