Is there a way to handle multiple projects with lots of duplications?

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I have two projects.

First I wrote the project number 1.
Then I decided to start project number 2 which was very similar to project number 1.
So I decided to clone the project number 1 and start from there.

The challenge is developing these two projects.

From now on, some changes in project number 1 have to be done in project number 2.
My problem is that I have to copy and paste some of new changes in project 2 which is exhausting and may cause problems (such as forgetting copying and pasting some codes).

Did you have any experience about this issue?
Or do you have any solutions?

1 Answers
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