sinew | Ruby DSL for structured web | Scraper library

I have a simple word cloud chart I am making: https://jsfiddle.net/kbhx64Ln/

It starts off with 15 max items in the cloud. However, I'd like to dynamically update that number to be based off a timer. I have:

I have defined a class called Container and inherits list to hold data from and XML file which containing debian package names, public keys, repositories and other data which is later used in the script.

I initialize a class variable as a list of this type and later in the code I want to fill it up but when assigning new values, all other already assign elements change their value to the newly assig one.

Disclaimer: I may be over complicating my code, but I'm doing it on purpose to get more practice classes.

Class definition --> GetFromXML.py

I have created a bash script with some post installation command for the distro deepin. Now my problem, that I really don't know how to resolve as I'm a very newbie with bash scripting, is that after a command is been choosen and executed,there is a command that came back to the main menu of the script. But When I'm on the main menu, the script isn't able to execute another command. If I choose an option and try to execute, nothing appen. The script use dialog for the minimal interface. Can someone help me to understand what is the problem?

This is the code

I have many similar URLs. And i want to get a string from them.

For example the URL is:- http://www.amazon.in/Sinew-Nutrition-Decaffeinated-Unroasted-Management/dp/B01LF7Y0S4/ref=sr_1_1?ie=UTF8&qid=1484716249&sr=8-1&keywords=green+coffee+beans

And I want to get "B01LF7Y0S4" value (without quotes)

We can consider "/dp/"the start point and the very first "/" after "/dp/" the end point.

Thanks in advance.