added support for singular ics in multiplication
added support for singular ics in multiplication

drufat/sympy,drufat/sympy,sampadsaha5/sympy,chaffra/sympy,jaimahajan1997/sympy,jaimahajan1997/sympy,postvakje/sympy,madan96/sympy,madan96/sympy,sampadsaha5/sympy,sampadsaha5/sympy,yashsharan/sympy,yashsharan/sympy,kaushik94/sympy,postvakje/sympy,skidzo/sympy,drufat/sympy,skidzo/sympy,yashsharan/sympy,souravsingh/sympy,kaushik94/sympy,souravsingh/sympy,chaffra/sympy,chaffra/sympy,jaimahajan1997/sympy,postvakje/sympy,souravsingh/sympy,skidzo/sympy,madan96/sympy,aktech/sympy,kaushik94/sympy,aktech/sympy,aktech/sympy