**Author details**

Najeeb Alam Khan1\*, Amber Shaikh1 , Faqiha Sultan2 and Asmat Ara3

\*Address all correspondence to: njbalam@yahoo.com

1 Department of Mathematics, University of Karachi, Karachi, Pakistan

2 Department of Sciences and Humanities, National University of Computer and Emerging Sciences, Karachi, Pakistan

3 Department of Computer Science, Mohammad Ali Jinnah University, Karachi, Pakistan
