Typo fix

作 -> 做
Typo fix
Typo fix
印 -> 打印
Typo fix

此处作者想表达的是 `putStrLn $ "Ok"` 输出 OK 而不是 "OK"
Typo fix

想 -> 像
Merge pull request #48 from douglarek/typo-fix

Typo fix