修改部分内容

src/utils.rs

@@ -46,15 +46,17 @@ pub fn parse_json_component(json: &str) -> String {
 
 // 生成一个随机的用户名
 // author: 通义
-pub fn generate_string() -> String {
+pub fn generate_string(len_min: i64, len_max: i64) -> String {
     let mut rng = rand::thread_rng();
-    let len = rng.gen_range(5..=10);
+    let len = rng.gen_range(len_min..=len_max);
     rng.sample_iter(&Alphanumeric)
-        .take(len)
+        .take(len as usize)
         .map(char::from)
         .collect()
 }
 
 pub fn generate_username(config: &Arc<Configuration>) -> String {
-   config.username_prefix().to_string() + generate_string().to_string().as_str()
+   config.username_prefix().to_string() + generate_string(
+    2,16-config.username_prefix().len() as i64
+   ).to_string().as_str()
 }