Gettin wrong answer for 2 out of 3 test cases

#1

Let binary[n] be total ways for size n.

I am having 2 cases:

  1. if starts with 1 then next should be 0
  2. if starts with 0 next can be anything

Therefore

binary[n]= binary[n-1] +binary[n-2]

So why am I getting wrong answer in my code.
Where am I wrong?

Please help.
Thank you in Advance