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Input under each section examples of your program running using different options
./bitmask -M “10110111” -s “10011010 11010001”
10010010
10010001
./bitmask -M “66” -s “77 77” -b8
66
66
./bitmask -M “66” -s “77s77” -b8 -ds
66
66
./bitmask -M “31 -s “30” -b10
30
./bitmask -M “FE” -s “FF” -b16
0xFE