function readOnly(count){ }
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You can use a query to retrieve topics from sobject and use DML delete.
Please refer below link.
https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_objects_topic.htm
https://automationchampion.com/tag/topics-in-salesforce/
http://salesforce.stackexchange.com/questions/145219/query-chatter-feed-topics-and-groups
Hope this helps you!
Please mark it as Best Answer if my reply was helpful. It will make it available for other as the proper solution.
Thanks and Regards
Sandhya