fix: extraction of token

Author: erikmd

tests/runtests.sh

@@ -177,7 +177,7 @@ handle_subdir () {
     # Get the token from the docker logs
     token=$(docker logs "$SERVERID" | \
                 grep -A 1 -e 'teacher token.*:' | tail -n 1 | \
-                sed -e 's/^.*[:-] //')
+                sed -e 's/^.*[:-] //' | tr -d '[:space:]')
 
     if [ -z "$token" ]; then
         red "Failed to get teacher token"