code: def test_normalize_index():
      idx = Index(["ＡＢＣ", "１２３", "ｱｲｴ"])  # noqa: RUF001
      expected = Index(["ABC", "123", "アイエ"])
      result = idx.str.normalize("NFKC")
      tm.assert_index_equal(result, expected)
  
imports: from datetime import datetime, timedelta
  import numpy
  import pytest
  from pandas import DataFrame, Index, MultiIndex, Series
  import pandas._testing
  from pandas.core.strings.accessor import StringMethods
  from pandas.tests.strings import object_pyarrow_numpy
label_desc: Use image node_id 37 for calling a global function with example usage: test_normalize_index() without return types