Implement present box

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/handler/api/reward/reward.go

@@ -0,0 +1,17 @@
+package reward
+
+import (
+	"fmt"
+)
+
+func RewardApi(action string) (res any, err error) {
+	switch action {
+	case "rewardList":
+		res, err = rewardList()
+	case "rewardHistory":
+		res, err = rewardHistory()
+	default:
+		err = fmt.Errorf("unimplemented action: reward: %s", action)
+	}
+	return res, err
+}