Implement left_rotate, right_rotate #38
Merged
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left_rotate and right_rotate are bit shift with rotation.
overflowed bits are moved to the other side.
example of left_rotate 1 bit
0b00000001
→0b00000010
0b10000000
→0b00000001
example of right_rotate 1 bit
0b10000000
→0b01000000
0b00000001
→0b10000000