Character Appears Even Number of Times
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.
- Must return either true or false
solve("aabbccdd") > true
All characters are seen twice, an even numbered of times, so we return true.
solve("abcdeffgg") > false
a,b,c,d and e are seen only once, an odd numbers times, so we return false.