public static Node insert(Node root, int data) {

                  Node inserter = new Node(data);
                  Node temp = root;
                  while (true) {
                      if (inserter.data <= temp.data) {
                          if (temp.left == null) {
                              temp.left = inserter;
                              break;
                          } else
                              temp = temp.left;

                      } else {
                          if (temp.right == null) {
                              temp.right = inserter;
                              break;
                          } else
                              temp = temp.right;

                      }
                  }

                  return root;
              }