NULL 3 b e 1 NULL a 6 c b 4 d c 2 e d 5 f ./push_swap 3 6 4 2 5 1 a b c d e f malloc malloc malloc malloc malloc malloc t_list t_node head tail num next prev
rotate NULL 3 c b 1 d e 6 f a 4 e f 2 NULL c 5 b a b c d e f d 3 c b 1 NULL e 6 f a 4 e NULL 2 a c 5 b a b c d e f stack A stack A head : a tail : d head : d tail : f rra tail -> prev