update code formatting

test

@@ -1,25 +1,44 @@
 #!/bin/sh
+
 mkdir -p temp
 trap 'rm -r temp' EXIT QUIT TERM INT
+
 tracked_files=$(git ls-tree --name-only HEAD PAT*/)
+
 for bin in "$@"; do
+    # this problem has not been solved, so there is no code for it
     [ "$tracked_files" = "${tracked_files%$bin*}" ] && continue
+
+    # PATBasic/1001 -> b1001, etc.
     dir=$(dirname "$bin")
     id=$(basename "$bin")
-    [ "$dir" = PATAdvanced ] && cat=a
-    [ "$dir" = PATBasic    ] && cat=b
-    [ "$dir" = PATTop      ] && cat=t
+    case "$dir" in
+        PATAdvanced) cat=a;;
+        PATBasic)    cat=b;;
+        PATTop)      cat=t;;
+    esac
+
+    # run test and compare output
     for sample in "samples/$cat$id-"*.in; do
         echo "testing $bin, sample $sample"
+        # use `printf "%s" output' to strip white spaces
         printf "%s" "$("$dir/$id" < "$sample" | tr -d '\0')" > temp/out
         printf "%s" "$(cat "${sample%.in}.out")" > temp/ans
         diff temp/out temp/ans || failed="$failed$bin $sample\n"
     done
 done
+
+str_check_output="Scroll back for comparison between answer and actuall output"
+color_red="\033[1;31m"
+color_green="\033[1;32m"
+color_reset="\033[1;0m"
+
 if [ -n "$failed" ]; then
-    printf "$failed" | while read -r b s; do
-        printf "\033[1;31m%s failed for sample %s\033[1;0m\n" "$b" "$s"
+    printf "$failed%s" | while read -r b s; do
+        printf "$color_red%s failed for sample %s$color_reset\n" "$b" "$s"
     done
-    printf "\033[1;31mSee the previous output for differences between correct output and execute output\033[1;0m\n"
+    printf "$color_red%s$color_reset\n" "$str_check_output"
     exit 1
+else
+    printf "$color_green%s$color_reset\n" "All passed!"
 fi