simplify_path.rs

struct Solution;
impl Solution {
    pub fn simplify_path(path: String) -> String {
        let dirs = path.split("/").filter(|&s| s != "").collect::<Vec<_>>();
        let mut ans = Vec::new();
        for &x in dirs.iter() {
            match x {
                ".." => {
                    ans.pop();
                }
                "." => {
                    continue;
                }
                _ => {
                    ans.push(x);
                }
            }
        }
        let mut ans = ans.join("/");
        ans.insert(0, '/');
        ans
    }
}

fn main() {
    Solution::simplify_path("/home/user/Documents/../Pictures".into());
    println!("{:?}", Solution::simplify_path("/../".into()));
    Solution::simplify_path("/.../a/../b/c/../d/./".into());
}