refractor into smaller modules

src/config.rs

@@ -0,0 +1,22 @@
+use std::error::Error;
+use std::fs;
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct Config {
+    pub listen_addr: String,
+    pub server_addr: String,
+    pub motd_server_addr: String,
+    pub rcon_addr: String,
+    pub rcon_password: String,
+    pub idle_timeout_secs: u64,
+    pub polling_interval_millis: u64,
+}
+
+impl Config {
+    pub fn load(path: &str) -> Result<Self, Box<dyn Error>> {
+        let content = fs::read_to_string(path)?;
+        let config: Config = toml::from_str(&content)?;
+        Ok(config)
+    }
+}