Password generator with user inputs

Hi,
I am new to bash scripting and i wanted to make a bash script that will generate a password for a user. The user must enter his/her name and the url of the site the password is used for. And the script will generate a password with those two elements in the password. So if the url is www(dot)twitter(dot)com and the name is Kevin i want twitter and Kevin in the password.

When the user enters Tom and outlook.live/owa the password should be something like Tomoutlook or outlookTom but i wanted to add random characters (lowercase, uppercase, numbers) so the password is 15 characters long.

for example:

name?

tom

url?

www(dot)instagram(dot)com

the output should be something like : tomR3instagram5 or 4instagramRTtom
Anyone can lead me in the right direction?