First Non Repeat
![First Non Repeat](/content/images/size/w2000/2015/08/BartSimpsonRepeatWords.png)
Write a JavaScript function to find the first non-adjacently-repeated character in a given string.
Examples:
"abbbbc"
returns"a"
because it's the first instance of a character that doesn't repeat adjacently."aaaabcd"
returns"b"
."aacccddeefg"
returns"c"
.