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ch6: fix code format
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@@ -4,8 +4,8 @@
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```go
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func (p *Point) ScaleBy(factor float64) {
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p.X *= factor
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p.Y *= factor
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p.X *= factor
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p.Y *= factor
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}
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```
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@@ -27,6 +27,7 @@ r := &Point{1, 2}
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r.ScaleBy(2)
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fmt.Println(*r) // "{2, 4}"
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```
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或者這樣:
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```go
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