use if let

src/main.rs

@@ -214,7 +214,7 @@ pub fn process_oss_files(oss_client: &OSSClient, bucket_name: &str, path: &str,
         print_message(MessageType::DEBUG, &format!("Read meta file: {}", meta_file_key));
     }
     let meta_file_content = match oss_client.get_file_content(bucket_name, meta_file_key)? {
-        None => "[]".to_string(),
+        None => "[]".to_owned(),
         Some(c) => c,
     };
     if *opt::IS_DEBUG {
@@ -259,14 +259,13 @@ pub fn stringity_json_array(vec: &Vec<String>) -> XResult<String> {
 // parse JSON array
 pub fn parse_json_array(arr: &str) -> XResult<Vec<String>> {
     let mut vec: Vec<String> = vec![];
-    if arr != "" {
+    if !arr.is_empty() {
         let json_arr = &json::parse(&arr)?;
         if json_arr.is_array() {
             for a in json_arr.members() {
-                match a.as_str() {
-                    None => (),
-                    Some(s) => vec.push(s.to_string()),
-                };
+                if let Some(s) = a.as_str() {
+                    vec.push(s.to_string());
+                }
             }
         }
     }