Mixed boundary condition in pdepe solver

I'm solving the following 1D convection diffusion system in pdepe solver.

I've to impose no-flux boundary condition at both left and rigth boundary.

function sol=main(Input)
format short
global D v
m = 0;

D = Input.D;
v = Input.v; 
x = Input.xmesh;
t = Input.tspan;

sol = pdepe(m,@pdefun,@icfun,@bcfun,x,t)
    function [g,f,s] = pdefun(x,t,c,DcDx)
    g = 1;
    f = D*DcDx;
    s = -v*DcDx;
    end
    
    function c0 = icfun(x)
    c0 = Input.c0;
    end

I'm not sure how to implement the no-flux boundary condition according to the general form given here

Is it correct to re-write the BC: - vC + DdC/dx = 0

as

C -( D/v) dC/dx = 0

where p = C

q = -(1/v)

f = DdC/dx

Is the following correct?

function [pl,ql,pr,qr] = bcfun(xl,cl,xr,cr,t)
 pl = cl; 
 ql = -1/v;
 pr = cr;
 qr = -1/v;
end

or
function [pl,ql,pr,qr] = bcfun(xl,cl,xr,cr,t)
 pl = -cl; 
 ql = 1/v;
 pr = -cr;
 qr = 1/v;
end