Add a better structure in the project

src/config.rs

@@ -7,7 +7,7 @@ use std::str::FromStr;
 #[derive(Debug)]
 pub struct Config {
     pub bind_address: SocketAddr,
-    pub database_url: Option<String>,
+    // pub database_url: Option<String>,
 }
 
 impl Config {
@@ -24,11 +24,11 @@ impl Config {
             return Err("In no-auth mode, BIND_ADDRESS must be 127.0.0.1".to_string());
         }
 
-        let database_url = env::var("DATABASE_URL").ok();
+        // let database_url = env::var("DATABASE_URL").ok();
 
         Ok(Self {
             bind_address,
-            database_url,
+            // database_url,
         })
     }
 }