diff --git a/problems/0028.实现strStr.md b/problems/0028.实现strStr.md
index 263c1689..2a81db88 100644
--- a/problems/0028.实现strStr.md
+++ b/problems/0028.实现strStr.md
@@ -1314,7 +1314,6 @@ impl Solution {
 
     pub fn str_str(haystack: String, needle: String) -> i32 {
         let (haystack_len, needle_len) = (haystack.len(), needle.len());
-        if haystack_len == 0 { return 0; }
         if haystack_len < needle_len { return -1;}
         let (haystack, needle) = (haystack.chars().collect::<Vec<char>>(), needle.chars().collect::<Vec<char>>());
         let mut next: Vec<usize> = vec![0; haystack_len];
@@ -1355,9 +1354,6 @@ impl Solution {
         next
     }
     pub fn str_str(haystack: String, needle: String) -> i32 {
-        if needle.is_empty() {
-            return 0;
-        }
         if haystack.len() < needle.len() {
             return -1;
         }