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initial memory usage: 5704 bytes

after int type changes: 5180 bytes

after basic bitmask: 3580 bytes

change color into u8: 1944 bytes

move color into bitmask: 1908 bytes

remove lock_tick from slot: 788 bytes

change some enums and make piece_matrix samller: 606 bytes

optimize piece_queue: 530 bytes

000 = 0
001 = 1
010 = 2
011 = 3
100 = 4
101 = 5
110 = 6

00000000
00000111

INIT = 0
ONCE_RIGHT = 1
TWICE = 2
ONCE_LEFT = 3

clockwise:
- 0 -> 1, 0
- 1 -> 2, 2
- 2 -> 3, 4
- 3 -> 0, 6

counter clockwise:
- 1 -> 0, 1
- 2 -> 1, 3
- 3 -> 2, 5
- 0 -> 3, 7