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A malloc and free Method for 64bit

    chunk struct
    |--------------------|
    | Last Chunk Size    |  last bit 0:free, 1:use
    |--------------------|  last two bit: 1:mmaped chunk
    | Chunk Size         |
    |--------------------|
    | Content or Next ptr|
    |                    |
    |--------------------|


bins_ptr

----------------------------------------------------------------------------------
    big chunk   |   0x18   |    0x20    |    0x28    |    0x30    |   0x38   | ...
-------|-------------|------------------------|------------------------|----------
       |             |                        |                        |
  |---------|   |---------|              |---------|               |---------|
  |  Chunk  |   |  Chunk  |              |  Chunk  |               |  Chunk  |
  |         |   |         |              |         |               |         |
  |         |   |         |              |         |               |         |
  |---------|   |---------|              |---------|               |---------|
       |             |                        |                        |
  |---------|   |---------|              |---------|               |---------|
  |  Chunk  |   |  Chunk  |              |  Chunk  |               |  Chunk  |
  |         |   |         |              |         |               |         |
  |         |   |         |              |         |               |         |
  |---------|   |---------|              |---------|               |---------|
       |             |                                                 |
  |---------|   |---------|                                        |---------|
  |  Chunk  |   |  Chunk  |                                        |  Chunk  |
  |         |   |         |                                        |         |
  |         |   |         |                                        |         |
  |---------|   |---------|                                        |---------|
      ...           ...