Solidity listing: IEEE Conference Template

I am trying to display solidity code in IEEE LAtex template for conference paper. The link for GitHub repository is:
IEEE CPS TEST_ZIP and the file names is: IEEE CPS test.zip

It is a two column template but the code is stretching from one column to the other column. Also it is giving language error with Solidity

The error image is:

I have included Solidity-highlighting.tex

Somebody please guide me.

Zulfi.