The school newspaper wants to publish a story with All of the even index characters (including 0) in uppercase and all the odd index characters in lowercase. KiNd oF lIkE ThIs.

Given a phrase, return the decimal percentage that represents how many characters in the phrase are correct.

Example:

evenUp("HeLlO") --> 1.0 // All 5 correct
evenUp("hi") --> 0.5 // 1 out of 2 correct
evenUp("HELlO") -->0.8 // 4 out of 5 correct