Disk management advice

#1
In disk managment under disk 0 it says Basic 91.75 GB then 39mb unallocated then C drive 87.06 GB NTFS then 4.66 GB Unallocated.

Can I do something with that 4.66 GB. or put another way what did I do wrong with the 4.66 GB partition that seems to be wasted space.
 


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