Added files for link creation, deletion and undo of deletion

updatelink.php

@@ -0,0 +1,18 @@
+<?php
+session_start();
+require_once 'db.inc.php';
+
+$session = init_cass_db();
+
+//GET ROW ID
+$statement = $session->prepare('SELECT * FROM DATA WHERE user=? AND shortlink=? AND url=? ALLOW FILTERING;');
+$result = $session->execute($statement,array('arguments' => array($_SESSION['user'],$_POST['old_link'], $_POST['old_url'])));
+$row_id = $result[0]['id'];
+
+
+
+$statement = $session->prepare('UPDATE data SET shortlink=?, url=?, user=? WHERE id=?;');
+$new_result = $session->execute($statement,array('arguments' => array($_POST['link'], $result[0]['url'], $result[0]['user'], $row_id)));
+
+http_response_code(204);
+?>