makke change status api case insensitive

src/lottery/lottery.service.ts

@@ -96,7 +96,10 @@ export class LotteryService {
 
   async changeStatus(changeStatus: ChangeStatusDto) {
     const foundUser = await this.userModel.findOne({
-      username: changeStatus.username,
+      username: {
+        $regex: changeStatus.username,
+        $options: 'i',
+      },
     });
     if (!foundUser) {
       throw new NotFoundException(