many improvements

enostr/src/pubkey.rs

@@ -0,0 +1,22 @@
+use serde_derive::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, Eq, PartialEq, Clone, Hash)]
+pub struct Pubkey(String);
+
+impl AsRef<str> for Pubkey {
+    fn as_ref(&self) -> &str {
+        &self.0
+    }
+}
+
+impl From<String> for Pubkey {
+    fn from(s: String) -> Self {
+        Pubkey(s)
+    }
+}
+
+impl From<Pubkey> for String {
+    fn from(pk: Pubkey) -> Self {
+        pk.0
+    }
+}