implementation deadEndsToString

[YuichiMorita]

simple implementation deadEndsToString function

[brianvanburken]

This is a duplicate of #16

[bburdette]

I like this version, with the row and col position. Nice!

[evancz]

@brianvanburken, it is desirable to have multiple issues or PRs about a topic.

• With issues, having more examples makes it easier to figure out. Having many examples in a single thread makes it very mentally difficult to disentangle when there are three or four different root, so "duplicates" is actually way nicer to work with in my experience! This is also a good way to gauge "how often is this discovered independently?" and does not put an unreasonable burden on reporters to be super informed about everything going on in other issues.
• With PRs, you get similar benefits. Seeing different perspectives on how to fix something only helps!

Point is, I like to have "duplicates" on my projects! I hope this doesn't sound like a reprimand. I just need to tell people about this because it is not the norm!

[joshuakb2]

Hey @evancz, are you reviewing this pull request? I just tried using this feature and got "TODO deadEndsToString". Even a simple implementation like this one would be a huge improvement.