port radixtree to rust

radixtree/src/serialize.rs

@@ -2,8 +2,7 @@
 
 use crate::error::Error;
 use crate::node::{Node, NodeRef};
-use std::convert::TryInto;
-use std::io::{Cursor, Read, Write};
+use std::io::{Cursor, Read};
 use std::mem::size_of;
 
 /// Current binary format version.
@@ -142,3 +141,16 @@ fn read_u32(cursor: &mut Cursor<&[u8]>) -> std::io::Result<u32> {
     
     Ok(u32::from_le_bytes(bytes))
 }
+
+/// Helper function to get the common prefix of two strings.
+pub fn get_common_prefix(a: &str, b: &str) -> String {
+    let mut i = 0;
+    let a_bytes = a.as_bytes();
+    let b_bytes = b.as_bytes();
+    
+    while i < a.len() && i < b.len() && a_bytes[i] == b_bytes[i] {
+        i += 1;
+    }
+    
+    a[..i].to_string()
+}