AWK: Calling Bash Version of echo Command with \c Option

I don't know how to embed Bourne shell echo with \c option inside AWK script, so I did this way.

echo.bash

#!/bin/bash
for i; do
echo -n $i
done


AWK script using above echo.bash script, so you can call bash version of echo:

$ awk -F, '{
cmd="./echo.bash \""$2"\" | openssl dgst -sha256"
while (cmd | getline line){
print line
}
close(cmd)
}' ./test.txt