71. 简化路径

例如，
path = "/home/", => "/home"
path = "/a/./b/../../c/", => "/c"

class Solution {
    public String simplifyPath(String path) {
        Stack<String> stack = new Stack<>();
        String[] p = path.split("/");
        for (int i = 0; i < p.length; i++) {
            if (!stack.empty() && p[i].equals("..")) {
                stack.pop();
            } else if (!p[i].equals(".") && !p[i].equals("") && !p[i].equals("..")) {
                stack.push(p[i]);
            }
        }
        List<String> list = new ArrayList(stack);
        return "/" + String.join("/", list);
    }
}