Function csv_challenge_ex::load_csv

pub fn load_csv(csv_file: PathBuf) -> Result<String, Error>

Usage:

use std::path::PathBuf;
use csv_challenge::load_csv;
let filename = PathBuf::from(r"F:\Rust_Practise\csv_challenge\src\input\challenge.csv");
let csv_data = load_csv(filename);
assert!(csv_data.is_ok());