Damage Calculator

The same calculator with some little fixes. Also implemented the suggestions.
Another thing, there are a lot of similar comparisons here. How about a method `boolean checkString(String s, boolean andOr, String args..)`

`boolean andOr` is `true` if `s` has to be equals to all `args..` and `false` if it is sufficient for `s` to be equal to at least one string in `args..`