Gst on work contract

In this case, rate of GST is 18%.

In this case if your turnover is more than 20 lakh/10 lakh as the case may be, than you are required to take registration under GST and charge GST on service @ 18%
If your turnover is less than above limit, than there is no need to take GST registration.

And goods ka

If you purchase Goods on behalf of Panchayat and bill of purchase is in name of Panchayat, and you are taking only reimbursement of same , than there is no GST.

But if you purchase Goods on your name and than sale it to panchayat or provide with your service, than Same GST @ 18% is applicable.

if You can invoice both Goods and services separately,
Than for service @ 18%
For Goods @ as per applicable rate.

And can i claimed itc on goods purchase

Yes, you can claim ITC on Goods purchase.