How to run one code for different users?

Question

Node.js

There is a telegram bot that conducts a quiz in a group. The bot has commands for managing the quiz (start and stop), as well as a rating system. Within the same group, the bot works perfectly. However, if the bot is added to another group, problems begin. For example, if the bot is simultaneously running in two groups, then if you use the "stop" command in one group, the bot will stop in two groups at once.

Question: How can I run one code separately for each group so that the control commands and the rating work only within the same group (even if the bot can be launched somewhere else)?