How do i copy elements of unsized array into another array?

Question

Here I am converting decimal number to binary and after conversion I wanted to find the binary gap.. for example if the input is decimal no is 129 then the binary equivalent is 10000001 and for this binary equivalent the binary gap is 6. I should find the binary gap.
https://code.sololearn.com/c07OcvhoN894/?ref=app

Answer 1

Thank you so much for your input .

Answer 2

But I am not sure of array size.. bcz for every input the size varies..