diff --git a/problems/0028.实现strStr.md b/problems/0028.实现strStr.md
index 697e8c2d..19d16e9f 100644
--- a/problems/0028.实现strStr.md
+++ b/problems/0028.实现strStr.md
@@ -1303,7 +1303,8 @@ impl Solution {
 
 ```rust
 impl Solution {
-    pub fn get_next(mut next: Vec<i32>, s: &Vec<char>) -> Vec<i32> {
+    pub fn get_next(next_len: usize, s: &Vec<char>) -> Vec<i32> {
+        let mut next = vec![-1; next_len];
         let mut j = -1;
         for i in 1..s.len() {
             while j >= 0 && s[(j + 1) as usize] != s[i] {
@@ -1328,8 +1329,7 @@ impl Solution {
             needle.chars().collect::<Vec<char>>(),
         );
         let mut j = -1;
-        let mut next = vec![-1; needle.len()];
-        next = Self::get_next(next, &needle_chars);
+        let next = Self::get_next(needle.len(), &needle_chars);
         for (i, v) in haystack_chars.into_iter().enumerate() {
             while j >= 0 && v != needle_chars[(j + 1) as usize] {
                 j = next[j as usize];