Well, if you sign a fixed CDD contract, then you are also expected to stay till the end. By law, both sides cant cancel it, except with common agreement.
If you dont expect to stay till the end, then dont sign, or ask for a shorter cdd which can also be renewed at most one more time depening on the company, or concerted into a cdi
If you dont expect to stay till the end, then dont sign, or ask for a shorter cdd which can also be renewed at most one more time depening on the company, or concerted into a cdi