diff --git a/Dell_iDRAC_fan_controller.sh b/Dell_iDRAC_fan_controller.sh
index 4a5d357..cec2edd 100644
--- a/Dell_iDRAC_fan_controller.sh
+++ b/Dell_iDRAC_fan_controller.sh
@@ -20,7 +20,7 @@ then
   readonly HEXADECIMAL_FAN_SPEED=$FAN_SPEED
 else
   readonly DECIMAL_FAN_SPEED=$FAN_SPEED
-  readonly HEXADECIMAL_FAN_SPEED=$(printf '0x%02x' $FAN_SPEED)
+  readonly HEXADECIMAL_FAN_SPEED=$(convert_decimal_value_to_hexadecimal $FAN_SPEED)
 fi
 
 # Check if the iDRAC host is set to 'local' or not then set the IDRAC_LOGIN_STRING accordingly
diff --git a/Dockerfile b/Dockerfile
index d9c2c52..eb648c3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,10 +17,10 @@ WORKDIR /app
 HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 CMD [ "/app/healthcheck.sh" ]
 
 # you should override these default values when running. See README.md
-#ENV IDRAC_HOST 192.168.1.100
+# ENV IDRAC_HOST 192.168.1.100
 ENV IDRAC_HOST local
-#ENV IDRAC_USERNAME root
-#ENV IDRAC_PASSWORD calvin
+# ENV IDRAC_USERNAME root
+# ENV IDRAC_PASSWORD calvin
 ENV FAN_SPEED 5
 ENV CPU_TEMPERATURE_THRESHOLD 50
 ENV CHECK_INTERVAL 60
diff --git a/functions.sh b/functions.sh
index 6acde9d..e8dd2bf 100644
--- a/functions.sh
+++ b/functions.sh
@@ -14,6 +14,15 @@ function apply_user_fan_control_profile () {
   CURRENT_FAN_CONTROL_PROFILE="User static fan control profile ($DECIMAL_FAN_SPEED%)"
 }
 
+# Convert first parameter given ($DECIMAL_NUMBER) to hexadecimal
+# Usage : convert_decimal_value_to_hexadecimal $DECIMAL_NUMBER
+# Returns : hexadecimal value of DECIMAL_NUMBER
+function convert_decimal_value_to_hexadecimal () {
+  local DECIMAL_NUMBER=$1
+  local HEXADECIMAL_NUMBER=$(printf '0x%02x' $DECIMAL_NUMBER)
+  echo $HEXADECIMAL_NUMBER
+}
+
 # Retrieve temperature sensors data using ipmitool
 # Usage : retrieve_temperatures $IS_EXHAUST_TEMPERATURE_SENSOR_PRESENT $IS_CPU2_TEMPERATURE_SENSOR_PRESENT
 function retrieve_temperatures () {