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Adding support for cd <No Args>.
If you copy buffer size 200 bytes. The conditions you have to handle like:
1) if 199th character falls on 2nd character of the UID.
2) If  199th character falls on the delimiter after the UID, and it meets to hit or miss, Do you save the state in permanent variable.

Solutions:
Keeping a static array and static index for saving last line, which has been read from buffer.
Keeping your status variable static or global one.