docs: update README_EN to lc problem: No.0058.Length of Last Word

Author: maolonglong

solution/0000-0099/0058.Length of Last Word/README_EN.md

@@ -68,6 +68,25 @@ class Solution {
 }
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn length_of_last_word(s: String) -> i32 {
+        let s = s.trim_end();
+        if s.len() == 0 {
+            return 0;
+        }
+        for (i, c) in s.char_indices().rev() {
+            if c == ' ' {
+                return (s.len() - i - 1) as i32;
+            }
+        }
+        s.len() as i32
+    }
+}
+```
+
 ### **...**
 
 ```