Need help!!!!!Garbage collection and compaction

[Dimpy]

Hi, I need help writing a subprogram that simulates garbage collection and compaction. If markbit is 1 node is in use and if 0 then it is returned to storage pool for reuse..Given list pointed by GCC change it so that markbits with 0 are in contiguous block of nodes and with 1s in contiguous block of nodes.Delete block of nodes containing markbit 0.
I'm asked to implement using singlylinklist if possible.

Anyone help me plz!!!