Return a capitalized version of s, i. e. make the first character.
返回一个大写版本的年代，即第一个字符，有大写，其余小写。
Given a string, find the first non-repeating character in it and return it's index.
给定一个字符串，找出其中第一个不重复出现的字符，返回其位置索引。
Given a string, find the first non-repeating character in it and return it's index.
给定一个字符串，寻找第一个不重复字符并返回其下标。
For the carriage return and linefeed character combination.
作为回车符和换行符的组合。
For the carriage return and linefeed character combination.
作为回车符和换行符的组合。
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