use std::io::{self, Write};
pub fn prompt_string(prompt: &str) -> String{
print!("{} ",prompt);
io::stdout().flush().expect("Error displaying your buffer.");
let mut input_user = String::new();
io::stdin().read_line(&mut input_user).expect("Error in text input.");
let response = input_user.trim();
return response.to_string();
}