diff --git a/cd.sh b/cd.sh
index dc240be..2f580c8 100644
--- a/cd.sh
+++ b/cd.sh
@@ -107,19 +107,34 @@ function cd_update_packages_catalog {
 }
 
 function cd_install_package {
-if [ "${1}" ] ; then
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian') apt-get install --yes "${1}" || exit ;;
-        *) exit 1 ;;
-    esac
-fi
+    if [ "${1}" ] ; then
+        case "${CD_OS_NAME}" in
+            'debian') apt-get install --yes "${1}" || exit ;;
+            *) exit 1 ;;
+        esac
+    fi
 }
 
 function cd_install_ca {
     cd_step "${FUNCNAME}"
     case "${CD_OS_NAME}" in
-        'debian') apt-get install --yes 'ca-certificates' || exit ;;
+        'debian') cd_install_package 'ca-certificates' ;;
+        *) exit 1 ;;
+    esac
+}
+
+function cd_install_git {
+    cd_step "${FUNCNAME}"
+    case "${CD_OS_NAME}" in
+        'debian') cd_install_package 'git' ;;
+        *) exit 1 ;;
+    esac
+}
+
+function cd_install_python {
+    cd_step "${FUNCNAME}"
+    case "${CD_OS_NAME}" in
+        'debian') cd_install_package 'python3' ;;
         *) exit 1 ;;
     esac
 }
@@ -150,10 +165,8 @@ function cd_main {
     cd_set_https_verification_on
     cd_update_packages_catalog
     cd_upgrade_packages
-
-cd_step "install Git"
-apt-get install --yes 'git' \
-|| exit
+    cd_install_git
+    cd_install_python
 
 DIRECTORY="$(mktemp --directory)" \
 || exit
@@ -163,9 +176,6 @@ git clone \
 "${DIRECTORY}" \
 || exit
 
-cd_step "install Python"
-apt-get install --yes 'python3' \
-|| exit
 cd_step "clean package cache"
 apt-get clean \
 || exit