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Here is the circuit. But here i am using L293D. Here you can make a good circuit. Here I am using stopping and moving motor. But here i am not using breaking. You can use breaking to stop, but only invert the motor leads. Here the voltage between two LDR's is subtracted and amplified and verified with a reference voltage for sensitivity. Here if sensitive voltage is less motor will stop.

But this circuit is having a disadvantage of multiple power supplies especially 12/-12V. So you can do it without multiple supply. The following circuit avoid the use of multiple power supply.