修正错误
叹号后面应该有空格的
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@ -353,7 +353,7 @@ greeting.endIndex.successor() // error
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for index in greeting.characters.indices {
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print("\(greeting[index]) ", terminator: "")
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}
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// 打印输出 "G u t e n T a g !"
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// 打印输出 "G u t e n T a g ! "
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```
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<a name="inserting_and_removing"></a>
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