/**
 * Write a function that takes a contact list and a lead list as input parameters and returns a new set of contacts
 * that are leads.
 *
 * @param contactList A set of contacts
 * @param leadList A set of leads
 * @return A set of contacts that are leads
 */
fun filterContacts(contactList: Set<String>, leadList: Set<String>): Set<String> {

    // Filter out the contacts that are leads
    val filteredContacts = contactList.intersect(leadList)

    // Return the filtered contacts
    return filteredContacts
}
/**
 * Write a function that takes a contact list and a lead list as input parameters and returns a new set of contacts
 * that are leads.
 *
 * @param contactList A set of contacts
 * @param leadList A set of leads
 * @return A set of contacts that are leads
 */
fun filterContacts(contactList: Set<String>, leadList: Set<String>): Set<String> {
/**
 * Write a function that takes a contact list and a lead list as input parameters and returns a new set of contacts
 * that are leads.
 *
 * @param contactList A set of contacts
 * @param leadList A set of leads
 * @return A set of contacts that are leads
 */
fun filterContacts(contactList: Set<String>, leadList: Set<String>): Set<String> {

    // Filter out the contacts that are leads
    val filteredContacts = contactList.intersect(leadList)

    // Return the filtered contacts
    return filteredContacts
}