Brianllamar's code

# What I did?

I solved the problem and wrote more test.  

1. I switched to `assert_equal` rathe than the plain `assert`
2. I used a constant rather than conditionals. 
    COINSTAR = {
                   p: 1,
    
       D: 10,                 Q: 25,
    
                   W: 100,

                
           N: 6,          H: 50, 
    }

Now it is a coin-star.

Also, added a Whole Dollar coin in there.