The Game of Master Mind is played as follows:
The computer has four slots, and each slot will contain a ball that is red (R), yellow (Y), green (G) or blue (B). For example, the computer might have RGGB (Slot 1 is red, Slots 2 and 3 are green, Slot 4 is blue).
You, the user, are trying to guess the solution. You might, for example, guess YRGB.
When you guess the correct color for the correct slot, you get a "hit:' If you guess a color that exists but is in the wrong slot, you get a "pseudo-hit:' Note that a slot that is a hit can never count as pseudo-hit.
For example, if the actual solution is RGBY and you guess GGRR, you have one hit and one pseudo-hit.
Write a method that, given a guess and a solution, returns the number of hits and pseudo-hits.