head:

Block 0: 16 bytes at ADDR, tag: "node 1"
Total: 1 allocated blocks, 16 allocated bytes
head,middle:

Block 0: 16 bytes at ADDR, tag: "node 1"
Block 1: 16 bytes at ADDR, tag: "node 2"
Total: 2 allocated blocks, 32 allocated bytes
head,middle,tail:

Block 0: 16 bytes at ADDR, tag: "node 1"
Block 1: 16 bytes at ADDR, tag: "node 2"
Block 2: 16 bytes at ADDR, tag: "node 3"
Total: 3 allocated blocks, 48 allocated bytes
1
2
3
1
2
1
3
1
3
1
free_block(ADDR, Middle again): free of non-allocated block
free_block(ADDR, Trying something different..): bad address
Done!
Block 0: 16 bytes at ADDR, tag: "node 1"
Block 2: 16 bytes at ADDR, tag: "node 3"
Total: 2 allocated blocks, 32 allocated bytes