Faster and Smaller C Programm

As others already pointed out, you should optimize your code both for speed and memory consumption (and it is a startling task, there is usually a trade-off between these two requirements).
Hand craft optimization is an art and your current attitude (posting an ASAP request at Quick Answer) strongly clashes with.

What you are asking for is something that is a combination of these qualities:

1. good judgement (generally comes with experience)
2. good knowledge of the target language you are using (usually comes with experience)
3. good education in the basics (requires the use of good books, and frequently good teachers.. can also be gotten through experience).

Bottom line, this is something you can learn, but getting good at it requires time and commitment and correct action (learning from your mistakes).. its not something reducible to a simple 2 paragraph answer on a website, or something you'll learn in a week.

Getting really good at programming, much like getting good at anything, is very time-intensive. Fast food it ain't.

Wow, I didn't think I'd have to break out the ol' crystal ball this early in the morning. Here's an answer that matches the lack of information in your question, yet strangely applies to pretty much any program written in any language - write better code.