upperCaseFirstLower method
Make the first letter of the word uppercase and the rest lowercase.
Implementation
String? upperCaseFirstLower() {
if (this != null) {
if (this!.length > 1) {
return this!.substring(0, 1).toUpperCase() +
this!.substring(1).toLowerCase();
} else
return this!.toUpperCase();
} else
return this;
}