Merge pull request #1893 from Logenleedev/my-contribution

minor modification 去除多余代码

problems/0509.斐波那契数.md

@@ -219,9 +219,6 @@ class Solution:
     def fib(self, n: int) -> int:
        
         # 排除 Corner Case
-        if n == 1:
-            return 1
-
         if n == 0:
             return 0
         

problems/剑指Offer58-II.左旋转字符串.md

@@ -194,6 +194,18 @@ class Solution:
 
 ```
 
+```python 3 
+# 方法五：另类的切片方法
+class Solution:
+    def reverseLeftWords(self, s: str, n: int) -> str:
+        n = len(s)
+        s = s + s 
+        return s[k : n+k]
+
+# 时间复杂度：O(n)
+# 空间复杂度：O(n)
+```
+
 Go：
 
 ```go