handling unknown commands

src/command/SetCommand.java

@@ -11,7 +11,7 @@ import java.util.Map;
 
 public class SetCommand implements CommandHandler {
     private final Storage storage = Storage.getInstance();
-    private final List<String>args;
+    private final List<String> args;
 
     public SetCommand(List<String> args) {
         this.args = args;

src/model/Command.java

@@ -21,7 +21,8 @@ public enum Command {
     WAIT("WAIT"),
     XADD("XADD"),
     XRANGE("XRANGE"),
-    XREAD("XREAD"), MULTI("MULTI"), EXEC("EXEC"), DISCARD("DISCARD");
+    XREAD("XREAD"), MULTI("MULTI"), EXEC("EXEC"), DISCARD("DISCARD"),
+    UNKNOWN("UNKNOWN");
 
     private final String value;
 

src/util/CommandUtil.java

@@ -42,6 +42,6 @@ public class CommandUtil {
             return Command.EXEC;
         } else if (command.toLowerCase().contains(Command.DISCARD.getValue()) || command.equalsIgnoreCase(Command.DISCARD.getValue())) {
             return Command.DISCARD;
-        } else return null;
+        } else return Command.UNKNOWN;
     }
 }