代码编写错误修正
代码中多写了一个 \ 特此修正。
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@ -275,7 +275,7 @@ extension Character {
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```swift
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```swift
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func printLetterKinds(word: String) {
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func printLetterKinds(word: String) {
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println("'\\(word)' is made up of the following kinds of letters:")
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println("'\(word)' is made up of the following kinds of letters:")
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for character in word {
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for character in word {
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switch character.kind {
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switch character.kind {
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case .Vowel:
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case .Vowel:
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