why this is showing no output

Question

You have been given an array/list(ARR) of size N. You need to swap every pair of alternate elements in the array/list.
You don't need to print or return anything, just change in the input array itself.

Sample Input 1:
1
6
9 3 6 12 4 32
Sample Output 1 :
3 9 12 6 32 4

My Approach:-
https://code.sololearn.com/cxAJeFs51x1d

Answer 1

US22 , look at the corrected code.
https://code.sololearn.com/cbrQA8mhyor0/?ref=app

Answer 2

TheWh¡teCat 🇧🇬 great, thank you