The problem also happens if the answer contains the letter once, but the guess contains it twice. Imagine the middle letter in the answer is an E, no other E an

The problem also happens if the answer contains the letter once, but the guess contains it twice. Imagine the middle letter in the answer is an E, no other E anywhere. I guess EXXXE (assuming that's a word). Both E are yellow: that's incorrect. There's 1 misplaced E and one superfluous E. Which is which is arbitrary. In the version of the game I made from my discord bot, I go left to right, so the E on the left would be yellow, the one on the right would be grey.