Issue with COTSCar.set_vec()

[hmedal]

It seems that COTSCar.set_vec() should modify COTSCar.vectorand not COTS.vector. Because it modifies Car.vector, calling COTSCar.set_vec() causes COTSCar.cost() to give a really high value. Here is an example:

carDesignVec = [12, 7, 6, 12, 9, 1, 0, 13, 9, 1, 39, 26, 2, 1, 33, 11, 4]
product = COTSCar()
print("COTSCar vec:", product.get_vec())
print("Car vec:", product.car.get_vec())
print("Cost: $", format(product.cost(), ",.2f"))
product.set_vec(carDesignVec)
print("COTSCar vec:", product.get_vec())
print("Car vec:", product.car.get_vec())
print("Cost: $", format(product.cost(), ",.2f"))

This yields:

COTSCar vec: [0, 0, 12, 9, 5, 4, 5, 9, 18, 0, 63, 70, 3, 2, 94, 46, 36]
Car vec: [0.3625, 0.15, 0.3926990815, 0.1125, 0.275, 1.65, 0.3926990815, 0.1125, 0.30000000000000004, 0.225, 0.3926990815, 0.894, 0.894, 0.6120817771521734, 1.8421606282386331, 1.3937518499228556, 0.007414368836192332, 0.3538183511215326, 0.3850508984033272, 5, 6, 7, 2, 7, 0, 3, 13, 20, 3, 0.5484287498156001, 0.7679158678739382, 0.17545563948117573, 0.10611775895215035, 0.2137548982186032, 0.7295061566429835, 0.24323006416003673, 0.9846194623778417, 0.2967268421009293, 0.4328799518163817]
Cost: $ 24,462.04
COTSCar vec: [0, 0, 12, 9, 5, 4, 5, 9, 18, 0, 63, 70, 3, 2, 94, 46, 36]
Car vec: [12, 7, 6, 12, 9, 1, 0, 13, 9, 1, 39, 26, 2, 1, 33, 11, 4, 0.3538183511215326, 0.3850508984033272, 5, 6, 7, 2, 7, 0, 3, 13, 20, 3, 0.5484287498156001, 0.7679158678739382, 0.17545563948117573, 0.10611775895215035, 0.2137548982186032, 0.7295061566429835, 0.24323006416003673, 0.9846194623778417, 0.2967268421009293, 0.4328799518163817]
Cost: $ 314,743,203.47

Note that calling COTSCar.set_vec() did not change the return value of COTSCar.get_vec().