Find longest sequence of zeros in binary representation of an integer.

BinaryGap.cs

using System;

class Solution
{
    public int solution(int N)
    {
        const int mask = 1;
        var binaryGap = 0;
        int? currentBinaryGap = null;
        
        while (N > 0)
        {
            var bigEndian = N & mask;
            
            if (bigEndian == 1)
            {
                if (currentBinaryGap > binaryGap)
                {
                    binaryGap = currentBinaryGap.Value;
                }
                
                currentBinaryGap = 0;
            }
            else
            {
                if (currentBinaryGap != null)
                {
                    currentBinaryGap++;
                }
            }
            
            N >>= 1;
        }
        
        return binaryGap;
    }
}