I pay my heartiest gratitude to the almighty for creating this beautiful world where I can share my pain and accomplish my dreams and live a wonderful life. Secondly, I bow to all the readers who are reading this book: Thank you for the encouragement. Thirdly, to my dad whose teachings made me this capable the result we have had this book in our hand. Last but not least a big Thanks to all my friends and peers for motivating me and putting unparalleled belief in me.