fix:excel_reader.py unicode bug

[fengdezhen666]

…鿿"这个字符在 Unicode 编码中的位置比较靠后，可能会导致一些非预期的结果或者性能问题

Description

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How Has This Been Tested?

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• My code follows the style guidelines of this project
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[Aries-ckt]

r+

[csunny]

r+