diff --git a/custom_tls_cert_gen/generate-custom-tls.sh b/custom_tls_cert_gen/generate-custom-tls.sh
index 3a9cf7d..c6a6aa0 100755
--- a/custom_tls_cert_gen/generate-custom-tls.sh
+++ b/custom_tls_cert_gen/generate-custom-tls.sh
@@ -2,23 +2,7 @@
 
 set -eu
 
-ERROR_COLOR='\033[0;31m';
-HIGHLIGHT_COLOR='\033[0;32m';
-INPUT_COLOR='\033[0;33m';
-NO_COLOR='\033[0m';
-
-
-function print_highlight() {
-  printf "${HIGHLIGHT_COLOR}$1${NO_COLOR}\n"
-}
-
-function print_error() {
-  printf "${ERROR_COLOR}$1${NO_COLOR}\n"
-}
-
-function input() {
-  read -p "$(echo -e ${INPUT_COLOR}$1 ${NO_COLOR})" $2
-}
+source ../utils/common.sh
 
 input "Specify the output path:" OUTPUT_PATH
 
@@ -35,6 +19,8 @@ if [[ ! -e "$OUTPUT_PATH" ]]; then
   exit;
 fi
 
+rm -rvf "$OUTPUT_PATH/*"
+
 input "Do you have cfssl installed?(y/n): " is_cfssl_installed
 
 CFSSLEXE=${OUTPUT_PATH}/cfssl
@@ -81,7 +67,9 @@ cd $OUTPUT_PATH
 
 input "Give a name to the CA certificate: " CA_CERT_NAME
 
-${CFSSLEXE} print-defaults csr | ${CFSSLEXE} gencert -initca - | ${CFSSLJSONEXE} -bare ${CA_CERT_NAME}-ca 
+CA_CERT_NAME=${CA_CERT_NAME}-ca
+
+${CFSSLEXE} print-defaults csr | ${CFSSLEXE} gencert -initca - | ${CFSSLJSONEXE} -bare ${CA_CERT_NAME} 
 
 CONFIG_CFSSL_JSON=${OUTPUT_PATH}/cfssl.json
 
@@ -100,7 +88,7 @@ input "Give a name to the certificate: " CERT_NAME
 
 input "Input the hostname(example.org,127.0.0.1): " CERT_HOSTNAME
 
-echo '{}' | ${CFSSLEXE} gencert -ca=ldap-ca.pem -ca-key=ldap-ca-key.pem -config=${CONFIG_CFSSL_JSON} \
+echo '{}' | ${CFSSLEXE} gencert -ca=${CA_CERT_NAME}.pem -ca-key=${CA_CERT_NAME}-key.pem -config=${CONFIG_CFSSL_JSON} \
     -hostname="${CERT_HOSTNAME}" - | ${CFSSLJSONEXE} -bare ${CERT_NAME}
 
 print_highlight "The custom TLS certificates are successfully generated in the path ${OUTPUT_PATH}."