chore: improve niuzi bank command

src/main/kotlin/cn/rtast/fancybot/util/Misc.kt

@@ -7,9 +7,15 @@
 
 package cn.rtast.fancybot.util
 
+import cn.rtast.rob.util.ob.OneBotListener
 import kotlin.random.Random
 
 fun randomBooleanWithProbability(probability: Double): Boolean {
     val randomValue = Random.nextInt(100)
     return randomValue <= (probability * 100)
+}
+
+suspend fun OneBotListener.getUserName(groupId: Long, userId: Long): String {
+    val info = this.getGroupMemberInfo(groupId, userId)
+    return info.card ?: info.nickname
 }