diff --git a/src/lib.rs b/src/lib.rs
index 9524601..a0d9e3a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -85,7 +85,7 @@ fn statement_to_string(statement: ExecuteStatementResponse) -> String {
                 .join("\n");
 
             col_names + &rows_as_str
-        }
+        },
         ExecuteStatementResponse::Deleted(number) => format!("rows deleted: {}", number),
         ExecuteStatementResponse::Explain(result) => result,
         ExecuteStatementResponse::Updated(number) => format!("rows updated: {}", number),
diff --git a/src/signature.rs b/src/signature.rs
index 9e6963f..04c67b3 100644
--- a/src/signature.rs
+++ b/src/signature.rs
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2019 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 use crate::GenResult;
 use core::fmt;
 use std::num::ParseIntError;
@@ -26,7 +42,7 @@ struct Signed<'a> {
 
 impl<'a> Signed<'a> {
     pub fn payload(&self) -> GenResult<&'a str> {
-        let pos = self.nonce_payload.find("\n").ok_or(err_msg(&format!(
+        let pos = self.nonce_payload.find('\n').ok_or(err_msg(&format!(
             "Invalid input: no \\n between nonce and payload in `{}`. \
              Should be <signature hex>\\n<nonce>\\n<sql_query>",
             self.nonce_payload
@@ -42,11 +58,11 @@ lazy_static! {
 /// hard-coded public key, could be replaced directly in a final Wasm binary
 // Full: 64 + 1 byte prefix
 static PUBLIC_KEY: [u8; 65] = [
-    0x04,
-    0xba,0x94,0x28,0x52,0xe4,0x35,0x39,0x1b,0x2a,0x6a,0x99,0x3f,0x33,0xf7,0x0c,0x43,
-    0x92,0x35,0xf4,0x84,0x15,0xe2,0x5c,0x66,0x8d,0x97,0xd5,0xb0,0xf2,0x63,0xb5,0x4e,
-    0x9d,0x98,0xcc,0xae,0xfd,0xc5,0xc6,0xca,0x23,0x7f,0xfc,0x0f,0x2f,0x63,0x35,0x13,
-    0x30,0xfa,0xaf,0xe3,0x1d,0x12,0x03,0x79,0xb8,0xdf,0xf9,0x82,0xa3,0x73,0x58,0xe3
+    0x04, 0xba, 0x94, 0x28, 0x52, 0xe4, 0x35, 0x39, 0x1b, 0x2a, 0x6a, 0x99, 0x3f, 0x33, 0xf7, 0x0c,
+    0x43, 0x92, 0x35, 0xf4, 0x84, 0x15, 0xe2, 0x5c, 0x66, 0x8d, 0x97, 0xd5, 0xb0, 0xf2, 0x63, 0xb5,
+    0x4e, 0x9d, 0x98, 0xcc, 0xae, 0xfd, 0xc5, 0xc6, 0xca, 0x23, 0x7f, 0xfc, 0x0f, 0x2f, 0x63, 0x35,
+    0x13, 0x30, 0xfa, 0xaf, 0xe3, 0x1d, 0x12, 0x03, 0x79, 0xb8, 0xdf, 0xf9, 0x82, 0xa3, 0x73, 0x58,
+    0xe3,
 ];
 
 fn get_pk() -> PublicKey {
@@ -60,7 +76,10 @@ fn err_msg(s: &str) -> Box<Error> {
 /// Converts hex string to a Vec<u8>
 fn decode_hex(s: &str) -> GenResult<Vec<u8>> {
     if s.len() % 2 != 0 {
-        return Err(err_msg(&format!("Invalid hex length: {} isn't divisible by 2", s.len())))
+        return Err(err_msg(&format!(
+            "Invalid hex length: {} isn't divisible by 2",
+            s.len()
+        )));
     }
     (0..s.len())
         .step_by(2)