State at case 2a

B = Free block; A = Address of free block; S = Free size
Allocation available bytes:   88 bytes

B  0: A: 0x0135B160, S:    0, next B: 0x0135B520; Start block
B  1: A: 0x0135B520, S:   88, next B: 0x0135B598
B  2: A: 0x0135B598, S:    0, next B: 0x00000000; End of region

State at case 2b

B = Free block; A = Address of free block; S = Free size
Allocation available bytes:   80 bytes

B  0: A: 0x0135B160, S:    0, next B: 0x0135B548; Start block
B  1: A: 0x0135B548, S:   80, next B: 0x0135B598
B  2: A: 0x0135B598, S:    0, next B: 0x00000000; End of region