Delete code and back to case [2,1]=>[1,2]
Coding production code to pass test without assignment, i create new list to return
Add test case  (1,2,3) => (1,2,3)
Test pass with split data into 2 section => less and greater than current and concat to result
Add test case  (2,1,3) => (1,2,3) that pass
Add test case  (1,3,2) => (1,2,3) that fail
Test pass that i sort sublist of lessList and greaterList
Add test other case that pass ... i got quick sort