public static double getGCContent(String s, int position, int windowSize) 
	{
		int end = s.length();
		end = Math.min(position+windowSize, end);
		
		double numGC =0;
		double numGood = 0;
		
		for( int x=position; x < end; x++)
		{
			char c = s.charAt(x);
			
			if( c == 'A' || c=='C' || c == 'G' || c=='T')
				numGood++;
			
			if( c== 'C' || c == 'G')
				numGC++;
		}
		
		if( numGood == 0 )
			return 0;
		
		return numGC / numGood;
		
	}