添加 0541.反转字符串II go版

problems/0541.反转字符串II.md

@@ -164,6 +164,30 @@ class Solution(object):
 
 
 Go：
+```go
+func reverseStr(s string, k int) string {
+    ss := []byte(s)
+    length := len(s)
+    for i := 0; i < length; i += 2 * k {
+        if i + k <= length {
+            reverse(ss[i:i+k])
+        } else {
+            reverse(ss[i:length])
+        }
+    }
+    return string(ss)
+}
+
+func reverse(b []byte) {
+    left := 0
+    right := len(b) - 1
+    for left < right {
+        b[left], b[right] = b[right], b[left]
+        left++
+        right--
+    }
+}
+```
 
 javaScript: