Creating a file path verifying type with Rust's inquire crate

paths_w_inquire.rs

use inquire::{validator::Validation, CustomType};
use std::path::{self, Path};

fn full_path(p: String) -> String {
    path::absolute(p.as_str())
        .unwrap()
        .canonicalize()
        .unwrap()
        .to_str()
        .unwrap()
        .to_string()
}

pub fn ui() {
    let filepath = CustomType::<String>::new("Preview file:")
        .with_starting_input("preview.mp3")
        .with_formatter(&full_path)
        .with_error_message("Please type a valid file path")
        .with_help_message("Path to file you associate with this version")
        .with_validator(|p: &String| {
            if Path::new(p.as_str()).exists() {
                Ok(Validation::Valid)
            } else {
                Ok(Validation::Invalid("Invalid file path".into()))
            }
        })
        .prompt();

    match filepath {
        Ok(fp) => println!("Aww yeah :: {}", full_path(fp)),
        Err(_) => println!("We could not process your donation"),
    }
}