题目：剑指Offer 05.替换空格

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.”

替换空格

1
2
3
4
5
6
7
8
9
10
11
12
func replace(s string, flag string) string {
	buffer := []byte{}
	bytes := []byte(s)
	for _, b := range bytes {
		if b == ' ' {
			buffer = append(buffer, []byte(flag)...)
		} else {
			buffer = append(buffer, b)
		}
	}
	return string(buffer)
}