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请实现一个函数，把字符串 s 中的每个空格替换成"%20"。示例 1：输入：s = "We are happy."输出："We%20are%20happy.&quo... 1970-01-01T08:00:00+08:00 Typecho https://blog.iletter.top/index.php/feed/atom/archives/42.html