Explosion Game rewrite requires

[qsef1256]

java.lang.NullPointerException: Cannot invoke "net.qsef1256.dacobot.game.explosion.domain.itemtype.ItemTypeEntity.getItemIcon()" because "itemType" is null
	at net.qsef1256.dacobot.game.explosion.domain.inventory.InventoryService.lambda$getInventoryEmbed$0(InventoryService.java:51)
	at java.base/java.util.Map.forEach(Map.java:713)
	at net.qsef1256.dacobot.game.explosion.domain.inventory.InventoryService.getInventoryEmbed(InventoryService.java:47)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:351)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:196)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:765)
	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:385)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:765)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:717)
	at net.qsef1256.dacobot.game.explosion.domain.inventory.InventoryService$$SpringCGLIB$$0.getInventoryEmbed(<generated>)
	at net.qsef1256.dacobot.game.explosion.command.InventoryCommand$SeeCommand.execute(InventoryCommand.java:66)
	at com.jagrosh.jdautilities.command.SlashCommand.run(SlashCommand.java:322)
	at com.jagrosh.jdautilities.command.impl.CommandClientImpl.onSlashCommand(CommandClientImpl.java:936)
	at com.jagrosh.jdautilities.command.impl.CommandClientImpl.onEvent(CommandClientImpl.java:626)
	at net.dv8tion.jda.api.hooks.InterfacedEventManager.handle(InterfacedEventManager.java:96)
	at net.dv8tion.jda.internal.hooks.EventManagerProxy.handleInternally(EventManagerProxy.java:88)
	at net.dv8tion.jda.internal.hooks.EventManagerProxy.handle(EventManagerProxy.java:70)
	at net.dv8tion.jda.internal.JDAImpl.handleEvent(JDAImpl.java:173)
	at net.dv8tion.jda.internal.handle.InteractionCreateHandler.handleCommand(InteractionCreateHandler.java:112)
	at net.dv8tion.jda.internal.handle.InteractionCreateHandler.handleInternally(InteractionCreateHandler.java:83)
	at net.dv8tion.jda.internal.handle.SocketHandler.handle(SocketHandler.java:39)
	at net.dv8tion.jda.internal.requests.WebSocketClient.onDispatch(WebSocketClient.java:1007)
	at net.dv8tion.jda.internal.requests.WebSocketClient.onEvent(WebSocketClient.java:893)
	at net.dv8tion.jda.internal.requests.WebSocketClient.handleEvent(WebSocketClient.java:871)
	at net.dv8tion.jda.internal.requests.WebSocketClient.onBinaryMessage(WebSocketClient.java:1046)
	at com.neovisionaries.ws.client.ListenerManager.callOnBinaryMessage(ListenerManager.java:385)
	at com.neovisionaries.ws.client.ReadingThread.callOnBinaryMessage(ReadingThread.java:276)
	at com.neovisionaries.ws.client.ReadingThread.handleBinaryFrame(ReadingThread.java:996)
	at com.neovisionaries.ws.client.ReadingThread.handleFrame(ReadingThread.java:755)
	at com.neovisionaries.ws.client.ReadingThread.main(ReadingThread.java:108)
	at com.neovisionaries.ws.client.ReadingThread.runMain(ReadingThread.java:64)
	at com.neovisionaries.ws.client.WebSocketThread.run(WebSocketThread.java:45)
	```

[qsef1256]

Cash 등의 부분에서도 문제가 발생하고 있으며, 별개의 issue로 다루는 것이 아니라 미완성인 부분을 완성시켜야 한다고 판단됨