Emailing a professor in another country for a feedback on a project that I'm working on?
First, assuming that you are in the US, learn to use professional grammar, spelling, punctuation, capitalization, and fonts.  Starting off with "i m a" will not get any professor's attention.  Try using "I am a".  

If English is not your primary language, and you must communicate in English, then find someone to help you.  

Next, just write up what you need, in detail.  Spell it out, like this.  

Dear Doctor ______,
I am a student in _________ and I am working on an idea regarding algorithms.  Specifically, ___________.  

I would like to get your feedback as you are an expert in algorithms.  May I stop by your office during office hours?  

Thanks in advance,
_________.