3、
3、 请实现一个函数，将一个字符串中的每个空格替换成“%20”。例如，当字符串为We Are Happy.则经过替换之后的字符串为We%20Are%20Happy。
思路：使用StringBuffer的charAt方法来遍历StringBuffer对象的所有字符，并进行判断和替换，使用个新对象接受并通过toString方法转成字符串。
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