binary_alpha_check.rb

def change a 
  smallcase = 'a'..'z' # smallcase.to_a.size #=> 26
  zeros = ("%026d" % 0).chars # creates array of 26 zeros
  check = Hash[smallcase.zip(zeros)] #create hash map of alphabet to zeros
  
  b = a.chars.each {|x| x.downcase!}
  b.each do |x|
    if check.include?(x)
      check[x] = 1
    end
  end
  
  check.values.join()
end

change('a   **&  bZ') #=>'11000000000000000000000001'