You are given a lowercase string as an argument. Return true if each character in the string is shown an even number of times, false if not.

Requirements

• Must return either true or false

Example #1

solve("aabbccdd")
> true

All characters are seen twice, an even numbered of times, so we return true.

Example #2

solve("abcdeffgg")
> false

a,b,c,d and e are seen only once, an odd numbers times, so we return false.