Do one of the following programming problems:
Smallest Power of 2
Write a function called largest_power(binary_string), which has
one parameter: a string of binary digits. Your function should compute and
return the smallest power of 2 that is greater than or equal to the
integer represented by the input binary string.
Two's Complement
Write a function called twos_complement(binary_string)
that has a single string parameter, binary_string, that
consists entirely of the characters '0' and '1'.
The function should return a new binary string that is the two's
complement of binary_string. The two's complement of a
binary number is one where all the bits to the left of the
right-most 1 are flipped, all other bits are unchanged. To flip a
bit, change it to the bit it is not. So to flip a 0, change it to a
1 and to flip a 1, change it to a 0.