Fix directory creation in Asset save method

src/data_mgt.rs

@@ -1,3 +1,5 @@
+use std::fs;
+
 use anyhow::Result;
 use chrono::{Duration, Utc};
 use serde::{Deserialize, Serialize};
@@ -50,6 +52,7 @@ impl Asset {
     }
 
     pub fn save(&self) -> Result<String> {
+        let _ = fs::create_dir_all(DATA_STORAGE);
         let id = self.id.clone();
         let path = format!("{}{}", DATA_STORAGE, self.id);
         std::fs::create_dir_all(DATA_STORAGE)?;