Task: Write a function called firstNonRepeated that takes a single string s as input and returns the first non-repeated character in the string. If there is no non-repeated character, return an empty string.
Input: A string s containing lowercase and/or uppercase English letters.
Output: A string representing the first non-repeated character in the input string or an empty string if there is no non-repeated character.
Example:
firstNonRepeated("hello") => "h"
firstNonRepeated("aabcc") => "b"
firstNonRepeated("aabbcc") => ""
** You can use any one of the following programming languages: Typescript, Java, Kotlin, Swift