Interview Question 1. given three parameters, first one the string, 2nd one is the letter where the sorted string will start, 3rd the index within the given sorted string

interview_q1.rb

str_parse = gets.chomp
s_char = gets.chomp
f_char = gets.chomp

alpha = "abcdefghijklmnopqrstuvwxyz".chars

iter = alpha.find_index(s_char)
while iter >= 0 
  substr_arg1 = str_parse.chars.find_index(alpha[iter])
	if (substr_arg1.nil?)
		iter = iter-1
	else 
		break
	end
end
if substr_arg1.nil?
	while iter < 26 
		substr_arg1 = str_parse.chars.find_index(alpha[iter])
		if (substr_arg1.nil?)
			iter = iter+1
		else 
			break
		end
	end
end


if (!substr_arg1.nil?)
	str_sorted = str_parse.chars.sort_by { |x| x.downcase}.join
	a = str_sorted.chars[0..(substr_arg1-1)].join
	b =str_sorted.chars[substr_arg1..str_sorted.length].join
	str_sorted = b+a
else
	str_sorted = str_parse.chars.sort_by { |x| x.downcase}.join
end


puts str_sorted[f_char.to_i]