fix preload clear

src/main.rs

@@ -40,7 +40,7 @@ async fn main() -> Result<()> {
     } // librqbit impl dependency
     let database = Database::init(&config.database)?;
     let peers = Peers::init(&config.initial_peer)?;
-    let mut preload = Preload::init(
+    let preload = Preload::init(
         config.preload,
         config.preload_max_filecount,
         config.preload_max_filesize,
@@ -261,7 +261,7 @@ async fn main() -> Result<()> {
                                 .delete(librqbit::api::TorrentIdOrHash::Id(id), false)
                                 .await?;
                             // cleanup tmp
-                            preload.clear();
+                            preload.clear()?;
                             if config.debug {
                                 println!("\t\t\tadd `{i}` to index.")
                             }

src/preload.rs

@@ -24,8 +24,16 @@ impl Preload {
         })
     }
 
-    pub fn clear(&mut self) {
-        self.directory.clear()
+    pub fn clear(&self) -> Result<()> {
+        for entry in fs::read_dir(&self.directory)? {
+            let e = entry?;
+            if e.file_type()?.is_dir() {
+                fs::remove_dir_all(e)?;
+            } else {
+                fs::remove_file(e)?;
+            }
+        }
+        Ok(())
     }
 
     pub fn directory(&self) -> &PathBuf {