A Solution for SFDC99 Opportunity Renewal challenge

CreateRenewal.trigger

trigger CreateRenewal on Opportunity (after insert, after update) {
	List<Opportunity> renewals = new List<Opportunity>();
	List<Opportunity> closedOpp = Trigger.new;
	RecordType renewalRecordType = [SELECT Id FROM RecordType WHERE Name LIKE '%Renewal%'];

	for(Opportunity opp: closedOpp){
		if(opp.IsClosed){
			Opportunity newOpp = new Opportunity();
			newOpp.AccountId = opp.AccountId;
			newOpp.Name = opp.Name+'Renewal';
			newOpp.StageName = 'Open';
			newOpp.CloseDate  = opp.CloseDate + 365;
			newOpp.RecordTypeId = openRecordType.Id;
			newOpp.OwnerId = opp.OwnerId;
			renewals.add(newOpp);
		}
	}
	insert renewals;
}