Building a T flip-flop with enable and reset using only a JK flip-flop that has no enable or reset, and use some necessary logic gates
You should not use Don't cares for J and K. The reason for this is J and K are not inputs in your circuit. Furthermore, As J and K are connected together, J = K.
Don't cares are only for inputs.
Reference:
Wikipedia: Don't care term



simulate this circuit &ndash; Schematic created using CircuitLab
The above circuit is a T Flip-Flop using J-K Flip-Flop and logic gates. It has Active High Enable and Active High Reset. The Reset is asynchronous.