add an option to clear session

src/main.rs

@@ -26,6 +26,8 @@ pub const GRAY:  &str = "\x1b[30m";
 struct Args {
     #[arg(long, default_value = "false", required = false, help = "If you want to agree to the DuckDuckGo TOS")]
     pub agree_tos: bool,
+    #[arg(long, short, default_value = "false", required = false, help = "Clear current session")]
+    pub clear: bool,
     #[arg()]
     pub query: Vec<String>,
 }
@@ -43,6 +45,12 @@ async fn main() {
     let args = Args::parse();
     let query = args.query.join(" ").trim().to_string();
 
+    if args.clear {
+        Session::clear();
+        println!("Cleared session");
+        exit(0);
+    }
+
     {
         let session = Session::create_or_restore("");
         if session.is_restored() {

src/session.rs

@@ -118,6 +118,13 @@ impl Session {
         self.ttl < Local::now()
     }
 
+    pub fn clear() {
+        let session = Session::create_or_restore("");
+        if session.is_restored() {
+            session.destroy().unwrap();
+        }
+    }
+
     pub fn is_restored(&self) -> bool {
         self.restored
     }