Daily Challenge 259 - Duplicate Encoder

The goal of this exercise is to convert a string to a new string where each character in the new string is "(" if that character appears only once in the original string, or ")" if that character appears more than once in the original string. Ignore capitalization when determining if a character is a duplicate.

Examples
"Success" => ")())())"
"(( @" => "))(("

Tests
"din"
"recede"

Good luck!

This challenge comes from obnounce on CodeWars. Thank you to CodeWars, who has licensed redistribution of this challenge under the 2-Clause BSD License!

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