TIL in Golang: Identifying Isograms & difference of squares

by @ilango

I did a couple of simple exercises on Exercism — identifying isograms and difference of squares.

After I finished them, I checked the community solutions and realized how brute-forced, inefficient my solution was. But that's the process of learning.

By checking community solutions, I learned about two methods available in the standard library: IsLetter and ContainsRune!

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