Test

1. Write a command line program that takes an input string, and returns which
character is consecutively repeated the most times. If multiple characters
repeat the same number of time, return all those characters.
 
For ex: "aaddddffffaa" will return 'f, d'
For ex: "cat dog ___" will return '_'

SOLUTION :

user_input = gets.chomp
list_of_chars = user_input.scan(/./)

ha = Hash.new
p1, p2 = [], []

list_of_chars.each_with_index do |c,index|
  
  if c == list_of_chars[index + 1]    
    p1 << index
    p2 << index + 1
    if list_of_chars[index + 1] != list_of_chars[index + 2]
        ha["#{list_of_chars[p1.first]}"] = "#{list_of_chars[p1.first..p2.last].count}"
    end
  else
    p1.clear
    p2.clear
  end
end

puts ha.select{|k,v| v == ha.max[1]}