下面代码中, 在transform_ts_path函数中,调用replace_uri会出现借用规则的问题. 如果不修改replace_uri的签名(必须要有self参数), 如何解决借用规则的问题

   |
57 |         for mpl in &mut self.media_list.segments {
   |                    -----------------------------
   |                    |
   |                    first mutable borrow occurs here
   |                    first borrow later used here
58 |            mpl.uri = self.replace_uri(&mpl.uri, path);
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ second mutable borrow occurs here

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pub struct M3U8_file {
    pub m3u8_file_path: String,
    pub ts_files_path: String,
    pub media_list: MediaPlaylist,
}

impl M3U8_file {
  

    pub fn transform_ts_path(&mut self, path: &str) {
        for mpl in &mut self.media_list.segments {
           mpl.uri = self.replace_uri(&mpl.uri, path);
        }
    }

    pub fn replace_uri(&mut self, orginal_uri: &String, path: &str) -> String {
        let delimiter = "/.";
        let sub_str = if let Some(index) = orginal_uri.find(delimiter) {
            &orginal_uri[index + delimiter.len()..]
        } else {
            ""
        };
        let replaced_uri = format!("{}/{}", path, sub_str).to_string();
        return replaced_uri;
    }
}