feat: account code extraction with zero-padding

filter/kyofilter

@@ -14,5 +14,15 @@ def parse_options(options_str):
     return options
 
 
+def get_account_code(options):
+    km = options.get('KmManagment', 'Default')
+    if km == 'Default' or not km.startswith('MG'):
+        return None
+    code = km[2:]
+    if not code.isdigit():
+        return None
+    return code.zfill(8)
+
+
 if __name__ == '__main__':
     pass