Update README_EN.md

Author: yanglbme

solution/0000-0099/0003.Longest Substring Without Repeating Characters/README_EN.md

@@ -301,30 +301,28 @@ class Solution {
 #### C
 
 ```c
+int lengthOfLongestSubstring(char* s) {
+    int freq[256] = {0};
+    int l = 0, r = 0;
+    int ans = 0;
+    int len = strlen(s);
+
+    for (r = 0; r < len; r++) {
+        char c = s[r];
+        freq[(unsigned char) c]++;
+
+        while (freq[(unsigned char) c] > 1) {
+            freq[(unsigned char) s[l]]--;
+            l++;
+        }
 
-int lengthOfLongestSubstring(char *s) {
-  int freq[256] = {0};
-  int l = 0, r = 0;
-  int ans = 0;
-  int len = strlen(s);
-
-  for (r = 0; r < len; r++) {
-    char c = s[r];
-    freq[(unsigned char)c]++;
-
-    while (freq[(unsigned char)c] > 1) {
-      freq[(unsigned char)s[l]]--;
-      l++;
-    }
-
-    if (ans < r - l + 1) {
-      ans = r - l + 1;
+        if (ans < r - l + 1) {
+            ans = r - l + 1;
+        }
     }
-  }
 
-  return ans;
+    return ans;
 }
-
 ```
 
 <!-- tabs:end -->