You can combine all the coordinate strings with a GroupBy node, aggregating the entire table (no grouping column) with the "unique concatenate" method using "/" as separator.
Then a String Manipulator with "join()" adds the purple static strings on both ends.
Since the last coordinate tuple is the same as the first one, maybe you can extract it with a Table Row to Variable node, append the “@” in front, then feed it into the String Manipulator as Flow Variable?
If a text based description isn’t enough, I can cook something up, no problem, but I need you to share the input table with me. There’s no way I’m gonna type all that