ccode: use Piecewise for sinc
ccode: use Piecewise for sinc

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