function newC = addValue(coll)
% add a filed named value to each CD
% value = stars / price
N = length(coll)
for index = 1:N
    cd = coll(index);
    prc = cd.price;
    if prc < .1
        prc = .1;
    end
    cd.value = cd.stars / prc;
    newC(index) = cd;
end