/**
 * This function updates the watermark of each photo in the given list.
 *
 * @param photos a list of photos
 * @param watermark the new watermark to be applied
 * @return the list of photos with updated watermarks
 */
fun updateWatermark(photos: MutableList<String>, watermark: String): List<String> {

    for (i in photos.indices) {
        photos[i] += watermark
    }
    return photos
}
/**
 * This function updates the watermark of each photo in the given list.
 *
 * @param photos a list of photos
 * @param watermark the new watermark to be applied
 * @return the list of photos with updated watermarks
 */
fun updateWatermark(photos: MutableList<String>, watermark: String): List<String> {
/**
 * This function updates the watermark of each photo in the given list.
 *
 * @param photos a list of photos
 * @param watermark the new watermark to be applied
 * @return the list of photos with updated watermarks
 */
fun updateWatermark(photos: MutableList<String>, watermark: String): List<String> {

    for (i in photos.indices) {
        photos[i] += watermark
    }
    return photos
}