Merge pull request #1051 from xiaofei-2020/stack5

添加（1047.删除字符串中的所有相邻重复项.md）：增加typescript版本

problems/1047.删除字符串中的所有相邻重复项.md

@@ -267,8 +267,32 @@ var removeDuplicates = function(s) {
 };
 ```
 
+TypeScript：
+
+```typescript
+function removeDuplicates(s: string): string {
+    const helperStack: string[] = [];
+    let i: number = 0;
+    while (i < s.length) {
+        let top: string = helperStack[helperStack.length - 1];
+        if (top === s[i]) {
+            helperStack.pop();
+        } else {
+            helperStack.push(s[i]);
+        }
+        i++;
+    }
+    let res: string = '';
+    while (helperStack.length > 0) {
+        res = helperStack.pop() + res;
+    }
+    return res;
+};
+```
+
 C:
 方法一：使用栈
+
 ```c
 char * removeDuplicates(char * s){
     //求出字符串长度