how can I solve this with mathod and swap

in java

Combiner By Toecoder "lius Timelimit: 1 implement a program Combiner that takes two Strings as parameters and combines them, alternating letters, starting with the first letter of the first 5 tring. followed by the first letter of the second 5tring, then second letter of first String. etc. The remaining lecters of the longer string are then appended to the end of the combination string and this combination string is returned. Input The input contains severat test cases. The firat line of input contain an integer N that indicates the number of test cases. Each test case is composed of a line containing two strings and each string contains between I and 50 characters. inclasive. Output Combine the two input strings, as shown in the example below and print the resulting string