removebitnum i remove a bit at specific position for example input num 10101 21 removebitnum 2 output 1001 9 removebitnum 4 output 101 5 removebitnum 0 output 1010 10
def remove_bit(num, i):
    mask = num >> (i + 1)
    mask = mask << i
    right = ((1 << i) - 1) & num
    return mask | right