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// @Title: 替换空格 (替换空格 LCOF)
// @Author: 15816537946@163.com
// @Date: 2022-02-02 21:19:37
// @Runtime: 0 ms
// @Memory: 2.1 MB

impl Solution {
    pub fn replace_space(s: String) -> String {
        let mut ans = vec![];
        s.chars().for_each(|x| {
            match x {
                ' ' => ans.append(&mut vec!['%', '2', '0']),
                _ => ans.push(x),
            };
        });
        ans.iter().collect()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_case1() {
        let s = String::from("We are happy.");
        assert_eq!(Solution::replace_space(s), "We%20are%20happy.");
    }
}