feat: fix triple repeats

[oskogstad]

For example 'arr' + 'rabarbra' should be 'arrabarba'

[loket]

Hi, and apologies for the late reply 🙈

First of all, thanks for your interest in this project! I had no idea other people than me still used this app, so that was fun 😄

As for your changes, I'll try to add some comments on the relevant lines. The whole project is in need of some love, and I have lots of issues that I still haven't added (for instance, upgrading to the latest version of 11ty). I'll try to add those in the coming days/weeks, and maybe I can try to do some work on it again 😄

[loket]

Uhh, how does this work?

@all-contributors please add @oskogstad for code

[allcontributors]

@loket

I've put up a pull request to add @oskogstad! 🎉