71. Simplify Path

这道题，比较简单，主要用链表来对路径进行操作，”.”的话，list就直接跳过，”..”的话，list删除尾节点，其他的都是放入尾节点

public class Solution {
    public String simplifyPath(String path) {
        LinkedList<String > list = new LinkedList<String>();
        String[] paths = path.split("/");
        for (int i=0;i<paths.length;i++){
            String str = paths[i];
            if (str.equals("."))continue;
            else if (str.equals(".."))list.pollLast();
            else if ("".equals(str))continue;
            else list.add(str);
        }
        if (list.size()==0)return "/";
        String result = "";
        for (String word:list){
            result+="/";
            result+=word;
        }
        return result;
    }
}