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並前往https://towardsdatascience.com/17-useful-ruby-string-methods-to-clean-and-format-your-data-9c9147ff87b9

17 Useful Ruby String Methods to Clean and Format Your Data

By default, the index starts from zero, but you can define it as you need. str = "abcdeU" temp = "" str.each_char.with_index(100) do |char, i|

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