diff --git a/end2end-tests/tests/cucumber_tests.rs b/end2end-tests/tests/cucumber_tests.rs
index d1bfa134e828c7c21568dfa57343de21c2f6d772..adb6a67c301d03f9e2ef07998cd778c20e5553ec 100644
--- a/end2end-tests/tests/cucumber_tests.rs
+++ b/end2end-tests/tests/cucumber_tests.rs
@@ -118,7 +118,7 @@ async fn who_have(world: &mut DuniterWorld, who: String, amount: u64, unit: Stri
     }
 
     // Create {amount} ÄžD for {who}
-    common::balances::set_balance(&world.api(), &world.client(), who, amount).await?;
+    common::balances::set_balance(world.api(), world.client(), who, amount).await?;
 
     Ok(())
 }
@@ -126,7 +126,7 @@ async fn who_have(world: &mut DuniterWorld, who: String, amount: u64, unit: Stri
 #[when(regex = r"(\d+) blocks? later")]
 async fn n_blocks_later(world: &mut DuniterWorld, n: usize) -> Result<()> {
     for _ in 0..n {
-        common::create_empty_block(&world.client()).await?;
+        common::create_empty_block(world.client()).await?;
     }
     Ok(())
 }
@@ -145,9 +145,9 @@ async fn transfer(
     let (amount, is_ud) = parse_amount(amount, &unit);
 
     if is_ud {
-        common::balances::transfer_ud(&world.api(), &world.client(), from, amount, to).await
+        common::balances::transfer_ud(world.api(), world.client(), from, amount, to).await
     } else {
-        common::balances::transfer(&world.api(), &world.client(), from, amount, to).await
+        common::balances::transfer(world.api(), world.client(), from, amount, to).await
     }
 }
 
@@ -157,7 +157,7 @@ async fn send_all_to(world: &mut DuniterWorld, from: String, to: String) -> Resu
     let from = AccountKeyring::from_str(&from).expect("unknown from");
     let to = AccountKeyring::from_str(&to).expect("unknown to");
 
-    common::balances::transfer_all(&world.api(), &world.client(), from, to).await
+    common::balances::transfer_all(world.api(), world.client(), from, to).await
 }
 
 #[then(regex = r"([a-zA-Z]+) should have (\d+) ÄžD")]
diff --git a/node/src/chain_spec/gen_genesis_data.rs b/node/src/chain_spec/gen_genesis_data.rs
index 73f447778345b06dcd5f5233819acd1e93406ccd..437f691fe87f5e8441c8b741227e3b0f6f44911c 100644
--- a/node/src/chain_spec/gen_genesis_data.rs
+++ b/node/src/chain_spec/gen_genesis_data.rs
@@ -257,7 +257,7 @@ where
         // Initial authorities
         if maybe_force_authority.is_some() {
             if smith_data.session_keys.is_some() {
-                return Err(format!("session_keys field forbidden",));
+                return Err("session_keys field forbidden".to_owned());
             }
             if *idty_index == 1 {
                 initial_authorities.insert(1, (identity.pubkey.clone(), true));
@@ -312,9 +312,7 @@ where
     }
 
     if maybe_force_authority.is_none() && online_authorities_counter == 0 {
-        return Err(format!(
-            "The session_keys field must be filled in for at least one smith.",
-        ));
+        return Err("The session_keys field must be filled in for at least one smith.".to_owned());
     }
 
     let genesis_data = GenesisData {