Exercise : mostCommonNames

Write a method mostCommonNames that accepts a Scanner for an input file with names on each line separated by spaces. Some names appear multiple times in a row. For example:

Benson Eric   Eric  Marty Kim  Kim Kim   Jenny  Nancy Nancy  Nancy  Paul  Paul
Stuart Stuart Stuart Ethan Alyssa Alyssa Helene Jessica Jessica Jessica Jessica
Jared  Alisa Yuki   Catriona  Cody   Coral   Trent Kevin  Ben Stefanie Kenneth

For each line, print the most commonly occurring name. If there's a tie, use the first name that had that many occurrences.

Most common: Kim
Most common: Jessica
Most common: Jared

Also return the total number of unique names in the whole file (e.g. 23 for the above input).