feat: add question 71

Author: yinxin630

71.data

@@ -0,0 +1,6 @@
+"/home/"
+"/../"
+"/home//foo/"
+"/a/./b/../../c/"
+"/a/../../b/../c//.//"
+"/a//b////c/d//././/.."

71.简化路径.js

@@ -0,0 +1,33 @@
+/*
+ * @lc app=leetcode.cn id=71 lang=javascript
+ *
+ * [71] 简化路径
+ * 
+ * 1. 按 / 分词
+ * 2. 用栈存结果, 新路径入栈, ..出栈(判空), .不变
+ */
+
+// @lc code=start
+/**
+ * @param {string} path
+ * @return {string}
+ */
+var simplifyPath = function(path) {
+    path = path.split(/\/+/);
+
+    const result = [];
+    for (let i = 0; i < path.length; i++) {
+        if (path[i] === '' || path[i] === '.') {
+            continue;
+        } else if (path[i] === '..') {
+            if (result.length) {
+                result.pop();
+            }
+        } else {
+            result.push(path[i]);
+        }
+    }
+
+    return '/' + result.join('/');
+};
+// @lc code=end