Maximum Streak

The Chef's programming platform is working on a feature to display the streak of a coder. On a particular day, if any submission is made by the coder, he is marked active on that day. You are given the history of user for $N$ days in the form of a string of $0$s and $1$s, where $1$ denotes being active on that day. The streak is defined as the maximum consecutive days on which he was activ