feat(func): Convert text ucase, lcase

cfddns.sh

@@ -39,6 +39,14 @@ getHostname() {
   (hostname -s)
 }
 
+lowercase() {
+  echo "$1" | tr '[:upper:]' '[:lower:]'
+}
+
+uppercase() {
+  echo "$1" | tr '[:lower:]' '[:upper:]'
+}
+
 ### functions
 badParam() {
   if [ "$1" = "null" ]; then