Please read How do I ask and answer homework questions? and Open letter to students with homework problems — Samathingamajig 24 secs ago

Welcome to Stack Overflow! How to ask homework question and Open letter to students with homework problems — Barmar 20 secs ago

Open letter to students with homework problems — matszwecja 54 secs ago

I wonder if SO's sister site softwareengineering.stackexchange.com would be more suitable? — k314159 11 secs ago

Please consider to edit your question accordingly to the SO guidelines. For this purpose have a look at TOUR, How to Ask and How do I ask and answer homework questions? Open letter to students with homework problems — fantaghirocco 50 secs ago

If you want help with your homework, please edit your question to show what you've come up with so far, and explain why it isn't working the way you expected it to. See also How do I ask and answer homework questions? and Open letter to students with homework problems — Klaus Gütter 58 secs ago

@MarsAtomic less nesting, easier to understand error handling, often referred to as "return early pattern" or similar - softwareengineering.stackexchange.com/questions/18454/… — zapl 32 secs ago