原书此处有误，按照原著183页正文里应该是7.14 (#604)

page:183
Exercise 7.14: string_reverse.go:Write a program that reverses a string, so “Google” is printed as ” elgooG”. (Hint: use a slice of bytes and conversions.)If you coded a solution with two slices, try a variant which uses only one (Hint: use swapping) If you want to be able to reverse Unicode-strings: use [ ]int !

eBook/13.8.md

@@ -117,7 +117,7 @@ FAIL
 
 **练习 13.4：**[string_reverse_test.go](exercises/chapter_13/string_reverse_test.go)
 
-为练习 7.11 [string_reverse.go](exercises/chapter_7/string_reverse.go) 写一个单元测试。
+为练习 7.14 [string_reverse.go](exercises/chapter_7/string_reverse.go) 写一个单元测试。
 
 把 string_reverse 放到自己的包 strev 中，只包含一个可导出函数 reverse。