Update 字符串相关.md

blogs/Algorithm/剑指 Offer/字符串相关.md

@@ -64,3 +64,13 @@ class Solution {
 }
 ```
 
+[58 - II. 左旋转字符串](https://leetcode-cn.com/problems/zuo-xuan-zhuan-zi-fu-chuan-lcof/)
+
+```java
+class Solution {
+    public String reverseLeftWords(String s, int n) {
+        return s.substring(n) + s.substring(0, n);
+    }
+}
+```
+