Original Word: "clarity"
New Word: "singularity"

The minimum number of keystrokes to change "clarity" to "singularity" is six (one to delete the "c" and five to type "singu").

#
=begin
variabls:
  original_word
  new_word
processes:
  Get a list of matching letters
  Remove matching letters from both the original and new words
  Get a count of remaining letters from the original word (count of letters to delete)
  Get a count of remaining letters from the new word (count of letters to add)
  Add both counts to get total number of keystrokes
output:
  The minimum number of keystrokes to change "---" to "---" is six (n to delete the "-" and n to type "-----").
=end

original_word = 'clarity'
new_word = 'singularity'

original_word_array = original_word.split("")
new_word_array = new_word.split("")
ow_index = original_word_array.length - 1
nw_index = new_word_array.length - 1
i = 0
x = 0

matches = []

#### Having trouble incrementing through the characters of each correctly to separate the matching and non matching characters
while i <= nw_index do
  if new_word_array[i] == original_word_array[x]
    puts "MATCH"
    matches << new_word_array[i]
    i += 1
    original_word_array.slice!(x)
    x = 0
  else
    x = x == ow_index ? 0 : (x + 1)
    i = 
  end

#!/usr/bin/env ruby

old='clarity'
new='singularity'

take = old.split(//).select{|c| new.sub!(c,'').nil?}.size

puts "Required number of moves is :- #{take + new.length}"

irb(main):009:0> old = 'car'
=> "car"
irb(main):010:0> new = 'bile'
=> "bile"
irb(main):011:0> take + new.length
=> 5