fix backlinks detection

src/main.rs

@@ -452,5 +452,5 @@ fn preprocess_markdown(string: String) -> String {
 fn normalize_name(filename: &str) -> String {
     let decoded = percent_decode_str(filename).decode_utf8_lossy();
     let result = decoded.strip_suffix(".md");
-    String::from(result.unwrap_or(filename))
+    String::from(result.unwrap_or(decoded.as_ref()))
 }