Iterable Batch apex showing an error

I am trying to create a new Batch class with an iterable and below is my basic code. When I am trying to save this code IC2 is showing the following error. But when I save the same class using SF develoer console it didn't have any issues. Please help.

Error:

Class BatchChatOfflineUserRun must implement the following methods or be declared abstract: execute(Database.BatchableContext, List<SObject>)

/**

Created by hsarikonda on 10/20/20.
/

global with sharing class BatchChatOfflineUserRun implements Database.Batchable<String>{

global Iterable<String> start(Database.BatchableContext BC) {
return new String[] { 'Harsha', 'Harsha2' };
}

global void execute(Database.BatchableContext BC, List<String> strings) {

}

global void finish(Database.BatchableContext BC) {
}

}

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