add rename_part

ecstore/src/utils/path.rs

@@ -1,3 +1,5 @@
+use std::path::Path;
+
 const GLOBAL_DIR_SUFFIX: &str = "__XLDIR__";
 
 pub const SLASH_SEPARATOR: &str = "/";
@@ -37,3 +39,7 @@ pub fn retain_slash(s: &str) -> String {
         format!("{}{}", s, SLASH_SEPARATOR)
     }
 }
+
+pub fn join(p1: &str, p2: &str) -> String {
+    Path::new(p1).join(Path::new(p2)).to_string_lossy().to_string()
+}