diff --git a/__crypto/simple_contract/src/cmd_credit_create.rs b/__crypto/simple_contract/src/cmd_credit_create.rs
index 3668389..3d7edb6 100644
--- a/__crypto/simple_contract/src/cmd_credit_create.rs
+++ b/__crypto/simple_contract/src/cmd_credit_create.rs
@@ -12,9 +12,15 @@ impl Command for CommandImpl {
 
     fn subcommand<'a>(&self) -> App<'a, 'a> {
         SubCommand::with_name(self.name()).about("Create credit contract subcommand")
-            .arg(Arg::with_name("name").long("name").short("n").required(true).takes_value(true).help("Contract name"))
-            .arg(Arg::with_name("limit").long("limit").short("l").required(true).takes_value(true).help("Contract credit limit"))
-            .arg(Arg::with_name("key").long("key").short("k").required(true).takes_value(true).help("Key pair"))
+        .arg(Arg::with_name("name").long("name").short("n")
+            .required(true).takes_value(true).help("Contract name")
+        )
+        .arg(Arg::with_name("limit").long("limit").short("l")
+            .required(true).takes_value(true).help("Contract credit limit")
+        )
+        .arg(Arg::with_name("key").long("key").short("k")
+            .required(true).takes_value(true).help("Key pair")
+        )
     }
     
     fn run(&self, _arg_matches: &ArgMatches, sub_arg_matches: &ArgMatches) -> CommandError {
diff --git a/__crypto/simple_contract/src/cmd_credit_issue.rs b/__crypto/simple_contract/src/cmd_credit_issue.rs
index 57aadc8..d5fdef9 100644
--- a/__crypto/simple_contract/src/cmd_credit_issue.rs
+++ b/__crypto/simple_contract/src/cmd_credit_issue.rs
@@ -12,10 +12,18 @@ impl Command for CommandImpl {
 
     fn subcommand<'a>(&self) -> App<'a, 'a> {
         SubCommand::with_name(self.name()).about("Issue credit contract subcommand")
-            .arg(Arg::with_name("name").long("name").short("n").required(true).takes_value(true).help("Contract name"))
-            .arg(Arg::with_name("receiver").long("receiver").short("r").required(true).takes_value(true).help("Receiver"))
-            .arg(Arg::with_name("credit").long("credit").short("c").required(true).takes_value(true).help("Credit"))
-            .arg(Arg::with_name("key").long("key").short("k").required(true).takes_value(true).help("Key pair"))
+        .arg(Arg::with_name("name").long("name").short("n")
+            .required(true).takes_value(true).help("Contract name")
+        )
+        .arg(Arg::with_name("receiver").long("receiver").short("r")
+            .required(true).takes_value(true).help("Receiver")
+        )
+        .arg(Arg::with_name("credit").long("credit").short("c")
+            .required(true).takes_value(true).help("Credit")
+        )
+        .arg(Arg::with_name("key").long("key").short("k")
+            .required(true).takes_value(true).help("Key pair")
+        )
     }
     
     fn run(&self, _arg_matches: &ArgMatches, sub_arg_matches: &ArgMatches) -> CommandError {
diff --git a/__crypto/simple_contract/src/cmd_credit_query.rs b/__crypto/simple_contract/src/cmd_credit_query.rs
index b1aeb73..6c69a75 100644
--- a/__crypto/simple_contract/src/cmd_credit_query.rs
+++ b/__crypto/simple_contract/src/cmd_credit_query.rs
@@ -12,9 +12,15 @@ impl Command for CommandImpl {
 
     fn subcommand<'a>(&self) -> App<'a, 'a> {
         SubCommand::with_name(self.name()).about("Query credit contract subcommand")
-            .arg(Arg::with_name("name").long("name").short("n").required(true).takes_value(true).help("Contract name"))
-            .arg(Arg::with_name("account").long("account").short("a").required(true).takes_value(true).help("Account"))
-            .arg(Arg::with_name("key").long("key").short("k").required(true).takes_value(true).help("Key pair"))
+        .arg(Arg::with_name("name").long("name").short("n")
+            .required(true).takes_value(true).help("Contract name")
+        )
+        .arg(Arg::with_name("account").long("account").short("a")
+            .required(true).takes_value(true).help("Account")
+        )
+        .arg(Arg::with_name("key").long("key").short("k")
+            .required(true).takes_value(true).help("Key pair")
+        )
     }
     
     fn run(&self, _arg_matches: &ArgMatches, sub_arg_matches: &ArgMatches) -> CommandError {
diff --git a/__crypto/simple_contract/src/cmd_credit_queryall.rs b/__crypto/simple_contract/src/cmd_credit_queryall.rs
index f70fcd4..0ae0e78 100644
--- a/__crypto/simple_contract/src/cmd_credit_queryall.rs
+++ b/__crypto/simple_contract/src/cmd_credit_queryall.rs
@@ -12,8 +12,12 @@ impl Command for CommandImpl {
     
     fn subcommand<'a>(&self) -> App<'a, 'a> {
         SubCommand::with_name(self.name()).about("Queryall credit contract subcommand")
-            .arg(Arg::with_name("name").long("name").short("n").required(true).takes_value(true).help("Contract name"))
-            .arg(Arg::with_name("key").long("key").short("k").required(true).takes_value(true).help("Key pair"))
+        .arg(Arg::with_name("name").long("name").short("n")
+            .required(true).takes_value(true).help("Contract name")
+        )
+        .arg(Arg::with_name("key").long("key").short("k")
+            .required(true).takes_value(true).help("Key pair")
+        )
     }
 
     fn run(&self, _arg_matches: &ArgMatches, sub_arg_matches: &ArgMatches) -> CommandError {
diff --git a/__crypto/simple_contract/src/cmd_credit_transfer.rs b/__crypto/simple_contract/src/cmd_credit_transfer.rs
index 3daf4b4..5194ccc 100644
--- a/__crypto/simple_contract/src/cmd_credit_transfer.rs
+++ b/__crypto/simple_contract/src/cmd_credit_transfer.rs
@@ -12,10 +12,18 @@ impl Command for CommandImpl {
 
     fn subcommand<'a>(&self) -> App<'a, 'a> {
         SubCommand::with_name(self.name()).about("Transfer credit contract subcommand")
-            .arg(Arg::with_name("name").long("name").short("n").required(true).takes_value(true).help("Contract name"))
-            .arg(Arg::with_name("receiver").long("receiver").short("r").required(true).takes_value(true).help("Receiver"))
-            .arg(Arg::with_name("credit").long("credit").short("c").required(true).takes_value(true).help("Credit"))
-            .arg(Arg::with_name("key").long("key").short("k").required(true).takes_value(true).help("Key pair"))
+        .arg(Arg::with_name("name").long("name").short("n")
+            .required(true).takes_value(true).help("Contract name")
+        )
+        .arg(Arg::with_name("receiver").long("receiver").short("r")
+            .required(true).takes_value(true).help("Receiver")
+        )
+        .arg(Arg::with_name("credit").long("credit").short("c")
+            .required(true).takes_value(true).help("Credit")
+        )
+        .arg(Arg::with_name("key").long("key").short("k")
+            .required(true).takes_value(true).help("Key pair")
+        )
     }
 
     fn run(&self, _arg_matches: &ArgMatches, sub_arg_matches: &ArgMatches) -> CommandError {
diff --git a/__crypto/simple_contract/src/cmd_genkey.rs b/__crypto/simple_contract/src/cmd_genkey.rs
index aedc7f5..3c947fb 100644
--- a/__crypto/simple_contract/src/cmd_genkey.rs
+++ b/__crypto/simple_contract/src/cmd_genkey.rs
@@ -10,8 +10,10 @@ impl Command for CommandImpl {
 
     fn subcommand<'a>(&self) -> App<'a, 'a> {
         SubCommand::with_name(self.name()).about("Generate key pair subcommand")
-            .arg(Arg::with_name("output").long("output").short("o").required(true).takes_value(true).help("Key pair output"))
-            .arg(Arg::with_name("tag").long("tag").short("t").takes_value(true).help("Key pair output"))
+        .arg(Arg::with_name("output").long("output").short("o")
+            .required(true).takes_value(true).help("Key pair output")
+        )
+        .arg(Arg::with_name("tag").long("tag").short("t").takes_value(true).help("Key pair output"))
     }
 
     fn run(&self, _arg_matches: &ArgMatches, sub_arg_matches: &ArgMatches) -> CommandError {
diff --git a/__crypto/simple_contract/src/credit.rs b/__crypto/simple_contract/src/credit.rs
index 70c42ba..91a91be 100644
--- a/__crypto/simple_contract/src/credit.rs
+++ b/__crypto/simple_contract/src/credit.rs
@@ -32,7 +32,13 @@ impl CreditContract {
             return simple_error!("Cannot issue 0 credit!");
         }
         if self.issue_amount + credit > self.credit_limit {
-            return simple_error!("Issue too much credit, current: {}, issue: {}, limit: {}, left: {}", self.issue_amount, credit, self.credit_limit, self.credit_limit - self.issue_amount);
+            return simple_error!(
+                "Issue too much credit, current: {}, issue: {}, limit: {}, left: {}",
+                self.issue_amount,
+                credit,
+                self.credit_limit,
+                self.credit_limit - self.issue_amount
+            );
         }
         match self.credit.get_mut(receiver) {
             None => { self.credit.insert(receiver.to_owned(), credit); },