You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 01_demo.rs
    path of file: ./repos/test-data-generation/examples
    
    the code of the file until where you have to start completion: extern crate
    
fn main() {
    // This example demonstrates the basic feature of the library to generate dates and people's names from the built-in demo data sets
    // using demo sample that is included in the library.

    // initalize a new DataSampelParser
    let dsp = DataSampleParser::new();

    // generate some test data using the demo functions
    println!("generate date:{}", dsp.demo_date());
    println!("generate person:{}", dsp.demo_person_name());
}