FormatFilename converts the filename string to the target naming style by calling method of stringx.

IsNamingValid validates whether the namingStyle is valid or not,return namingStyle and true if it is valid, or else return empty string and false, and it is a valid value even namingStyle is empty string.

NamingCamel defines the camel spell case.

NamingLower defines the lower spell case.

NamingSnake defines the snake spell case.

NamingStyle the type of string.