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Merge pull request #79 from cloverstd/patch-1
typo: `str` should be `s`
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@ -268,7 +268,7 @@ fmt.Printf("%#v\n", string([]rune{'世', '界'})) // 世界
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```go
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func forOnString(s string, forBody func(i int, r rune)) {
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for i := 0; len(s) > 0; {
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r, size := utf8.DecodeRuneInString(str)
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r, size := utf8.DecodeRuneInString(s)
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forBody(i, r)
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s = s[size:]
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i += size
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