1. School of Mathematics and Physics, Anhui Jianzhu University, Hefei 230601,China
2. Department of Mathematics, Khawaja Fareed University of Engineering & Information Technology, 64200, Rahim Yar Kahn, Department of Mathematics, University of the Punjab Lahore 54590,Pakistan
3. Department of Mathematics, University of the Punjab Lahore 54590,Pakistan
4. Department of Mathematics, Khwaja Fareed University of Engineering & Information Technology, 64200, Rahim Yar Khan,Pakistan