ch5-05 done
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@ -119,6 +119,7 @@ $ ./outline2 http://gopl.io
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```Go
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func ElementByID(doc *html.Node, id string) *html.Node
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```
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練習 **5.9** :編寫函數 expand,將s中的"foo"替換爲f("foo")的返迴值。
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```go
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