Telephonic Round 45mins

We introduced to each other in first 15mins and after that I got a question :-
1]Method takes an input as a List of strings(with special characters) output should be one single string
2]Second method takes input of string convert it to list of strings
3]At last initial input should match output of 2nd method
for e.g.
Method one will take List a = {"a","b","b,|123"} output should be "abb,|123"
Method Two will take input as "abb,|123" output should match with a
Contraint :- no method can call each other

Based on question type i am assuming interviewer was from python background.

waiting for result

Can someone please tell me if this question is available on leetcode or not?
OR did I miss any question to ask?