fix sum all first scores

Author: SlimMicheals

individual-shell-tools/awk/script-06-stretch.sh

@@ -5,4 +5,5 @@ set -euo pipefail
 # NOTE: This is a stretch exercise - it is optional.
 
 # TODO: Write a command to output the total of adding together all players' first scores.
+awk '{sum += $3} END {print sum}' scores-table.txt
 # Your output should be exactly the number 54.