Here on Line 11 and 12 Both Comment says about moving slow pointer _**(on Line 11 - slow moves by 1, on Line 12 slow moves by 2 )**_. Isn't should be fast pointer on line 12 or I am getting something wrong. 
Here on Line 11 and 12 Both Comment says about moving slow pointer (on Line 11 - slow moves by 1, on Line 12 slow moves by 2 ).
Isn't should be fast pointer on line 12 or I am getting something wrong.