Structured files/directories and nip01, nip02, nip17 implementation

src/nips/nip02.rs

@@ -0,0 +1,23 @@
+use anyhow::Result;
+use nostr_sdk::prelude::*;
+use std::time::Duration;
+
+/// Ruft das letzte Kontaktlisten-Event (Kind 3) für den Benutzer ab.
+pub async fn get_contact_list_event(client: &Client) -> Result<Option<Event>> {
+    let signer = client.signer().await?;
+    
+    // FIX: Die Methode heißt jetzt get_public_key()
+    let public_key = signer.get_public_key().await?;
+
+    let filter = Filter::new()
+        .author(public_key)
+        .kind(Kind::ContactList)
+        .limit(1);
+
+    let timeout = Duration::from_secs(10);
+    
+    // fetch_events nimmt einen einzelnen Filter
+    let events = client.fetch_events(filter, timeout).await?;
+    
+    Ok(events.into_iter().next())
+}