chore: use ext property instead of func

src/main/kotlin/cn/rtast/fancybot/commands/lookup/TheCatCommand.kt

@@ -26,7 +26,7 @@ class TheCatCommand : BaseCommand() {
     override suspend fun executeGroup(listener: OneBotListener, message: GroupMessage, args: List<String>) {
         val imageBase64= Http.get(theCatApiUrl)
             .fromArrayJson<List<Cat>>().first().url
-            .proxy().toURL().readBytes().encodeToBase64()
+            .proxy.toURL().readBytes().encodeToBase64()
         val msg = MessageChain.Builder().addImage(imageBase64, true).build()
         message.reply(msg)
     }

src/main/kotlin/cn/rtast/fancybot/commands/misc/TTSCommand.kt

@@ -36,7 +36,7 @@ class TTSCommand : BaseCommand() {
             .build()
         val response = Http.post<TTSResponse>(ttsApiUrl, form)
         val msg = MessageChain.Builder()
-            .addRecord(response.url.proxy())
+            .addRecord(response.url.proxy)
             .build()
         listener.sendGroupMessage(message.groupId, msg)
     }

src/main/kotlin/cn/rtast/fancybot/util/str/StringFormatter.kt

@@ -47,6 +47,4 @@ fun Int.formatToMinutes(): String {
     return "$minutes:${if (remainingSeconds < 10) "0" else ""}$remainingSeconds"
 }
 
-fun String.proxy(): String {
-    return this.replace("https://", "https://proxy.rtast.cn/https/")
-}
+val String.proxy: String get() = this.replace("https://", "https://proxy.rtast.cn/https/")