Adding a field in Path Structure and Plan Structure

Here is my problem and also the question. I'd like adding a field in
Path structure and Plan structure as follows:

typedef struct Path{
....bla bla bla

Cost energy_cost;

....bla bla bla

}

typedef struct Plan{
....bla bla bla

Cost energy_cost;

....bla bla bla

}

Also, I have modified the funscopy.c and every related place where the
other field total_cost appears. Right now, the compile is fine and
build is fine. However, everytime the server is running and I send a
query to the server, it crashed. as

psql:1.sql:23: server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
psql:1.sql:23: connection to server was lost

Is there anyone who can help me with it?

Thanks very much~!

--
Zichen Xu - X.Z.C.
University of South Florida
Computer Science and Engineering
33620, Flower Ave
Tampa, FL
徐子晨