fix clippy feedbacks and format code

yaserde/src/ser/mod.rs

@@ -12,17 +12,18 @@ pub fn to_string<T: YaSerialize>(model: &T) -> Result<String, String> {
   Ok(String::from(data))
 }
 
-pub fn to_string_with_config<T: YaSerialize>(
-  model: &T,
-  config: &Config,
-) -> Result<String, String> {
+pub fn to_string_with_config<T: YaSerialize>(model: &T, config: &Config) -> Result<String, String> {
   let buf = Cursor::new(Vec::new());
   let cursor = serialize_with_writer(model, buf, config)?;
   let data = str::from_utf8(cursor.get_ref()).expect("Found invalid UTF-8");
   Ok(String::from(data))
 }
 
-pub fn serialize_with_writer<W: Write, T: YaSerialize>(model: &T, writer: W, _config: &Config) -> Result<W, String> {
+pub fn serialize_with_writer<W: Write, T: YaSerialize>(
+  model: &T,
+  writer: W,
+  _config: &Config,
+) -> Result<W, String> {
   let mut serializer = Serializer::new_from_writer(writer);
   match model.serialize(&mut serializer) {
     Ok(()) => Ok(serializer.into_inner()),
@@ -112,10 +113,10 @@ pub struct Config {
 
 impl Default for Config {
   fn default() -> Self {
-    Config{
+    Config {
       perform_indent: false,
       write_document_declaration: true,
-      indent_string: None
+      indent_string: None,
     }
   }
 }