refactor. remove unused code

Author: ryansmith3136

src/api.rs

@@ -273,7 +273,7 @@ pub async fn limit(
     }
     if account_limit
         .rate
-        .check_key(&origin_ip.into_inner())
+        .check_key(&origin_ip.to_string())
         .is_err()
     {
         return Err(Error::TooManyRequests(Some(String::from(
@@ -407,12 +407,6 @@ impl fmt::Display for OriginIp {
     }
 }
 
-impl OriginIp {
-    pub fn into_inner(self) -> String {
-        self.0.to_string()
-    }
-}
-
 #[axum::async_trait]
 impl<S: Send + Sync> FromRequestParts<S> for OriginIp {
     type Rejection = Error;