How do I get matched letter from 2 different variables?

I need help on something I have string variables curWord & typeWord and matching I want to check if typeWord is having letters matching with curWord, but if typeWord has any letter which is repeating then I want to check if curWord also has that word repeating then I want that letter to be added in matching variable twice but if letter is repeating in typeWord only and curWord has it only once then I want to add it to matching only once.

for example:

Example: 1

curWord = green

typeWord = omega

then matching will be = ge

Example: 2

curWord = green

typeWord = dreed

then matching will be = ree

Example: 3

curWord = great

typeWord = dreed

then matching will be = re

One way could be to find individual letters in the first string in the second. Anytime a letter is found you’d remove that letter from the second. It would mess up the second string so you’d want to copy it first. Should be pretty doable in a function:

function findMatches(a, b)
-- var match=""
-- var letter=""
-- var i=0
-- repeat len(a) times
-- -- set letter to mid(a,loopindex,i)
-- -- set i to find(b, letter)
-- -- compare: i>-1
-- -- -- add letter to match
-- -- -- set b to left(b,i)&right(b, len(b)-1-i)
-- -- -- set return value to match

R0J0hound,I tried but it returns nothing, matching is still blank