new_contents: class Solution:
      def binaryGap(self, n: int) -> int:
          current= 1
          last1 = -1
          out = 0
          while n > 0:
              if n%2 == 1:
                  if last1 >= 1:
                      out = max(out, current - last1)
                  last1 = current
              current += 1
              n = n//2
          return(out)
          
  
subject: Add 868_Binary_Gap.py (#23)