return token public key as a string when subscribe to new keypair

src/service/btc.rs

@@ -173,7 +173,7 @@ impl TokenClient for BtcClient {
 
         Ok(TokenSubscribtion {
             secret_key: serialize(&btc_priv.to_bytes()),
-            public_key: serialize(&btc_pub.to_bytes()),
+            public_key: btc_pub.to_string(),
         })
     }
 

src/service/sol.rs

@@ -227,7 +227,7 @@ impl TokenClient for SolClient {
             .get_balance(&keypair.pubkey())
             .map_err(|err| SolFailed::from(err))?;
 
-        let public_key = serialize(&keypair.pubkey());
+        let public_key = keypair.pubkey().to_string();
         // NOTE we send keypair for sol as secret_key
         let secret_key = serialize(&keypair);