/**
 * Given a list of photos and a list of already processed photos,
 * return a list of photos that have not been processed yet.
 */
fun processPhotos(photos: List<String>, processedPhotos: List<String>): List<String> {

    val unprocessedPhotos = mutableListOf<String>()

    for (photo in photos) {
        if (photo !in processedPhotos) {
            unprocessedPhotos.add(photo)
        }
    }
    
    return unprocessedPhotos
}
/**
 * Given a list of photos and a list of already processed photos,
 * return a list of photos that have not been processed yet.
 */
fun processPhotos(photos: List<String>, processedPhotos: List<String>): List<String> {
/**
 * Given a list of photos and a list of already processed photos,
 * return a list of photos that have not been processed yet.
 */
fun processPhotos(photos: List<String>, processedPhotos: List<String>): List<String> {

    val unprocessedPhotos = mutableListOf<String>()

    for (photo in photos) {
        if (photo !in processedPhotos) {
            unprocessedPhotos.add(photo)
        }
    }
    
    return unprocessedPhotos
}