in source/stack-name-formatter/index.ts [13:19]
export async function handleCreate(props: IResourceProperties): Promise<CompletionStatus> {
props.StackName = props.StackName.toLowerCase();
return Promise.resolve({
Status: StatusTypes.Success,
Data: { Value: props.StackName.length < 8 ? props.StackName : props.StackName.substr(0, 7) }
})
}