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I am not sure of what load you are expecting for the motors (depends on ur robot).
I have worked a bit on CD drives, which use motors for the Load/Eject, disk rotation and the Reading head movement.
For this they normally use BA5813FM or BA5983FM (or similar) from ROHM.
These are 4 channel motor drives, so you can control more motors with a signle driver IC.
Actually you must know how much maximum current of the motor..then you can decide what is the suitable driver can be used.For your information,if your motor use less than 1Amp, you can use driver L293B.Its will support the current maximum up to 1Amp...for further knowledge about line following visit at https://robotku.blogspot.com.