Fix hook scripts: shebang placement and whitespace removal logic (#28)

* Initial plan

* Fix hook scripts: shebang placement and whitespace removal

Co-authored-by: djeada <37275728+djeada@users.noreply.github.com>

* Add detailed comment explaining trailing whitespace removal pattern

Co-authored-by: djeada <37275728+djeada@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: djeada <37275728+djeada@users.noreply.github.com>

Author: Copilot

src/beautify_script.sh

@@ -1,4 +1,3 @@
-# hooks/beautify_script.sh
 #!/usr/bin/env bash
 
 # Ensure tput has something to work with (avoids set -e abort)
@@ -103,3 +102,4 @@ main() {
 }
 
 main "$@"
+

src/remove_trailing_whitespaces.sh

@@ -25,7 +25,10 @@ remove_trailing_whitespaces() {
         if [[ $line == *[[:space:]] ]]; then
             echo "Found trailing whitespaces in line: ${line}"
             if [[ $checkonly -eq 0 ]]; then
-                echo "${line/%[[:space:]]/}" >> "${file}".tmp
+                # Remove all trailing whitespace using parameter expansion:
+                # ${line##*[![:space:]]} finds trailing whitespace (everything after last non-space char)
+                # ${line%...} removes that trailing portion from line
+                echo "${line%"${line##*[![:space:]]}"}" >> "${file}".tmp
             else
                 status=1
             fi