How to resolve "unresolved import" in Rust when using VS Code?

I'm fairly new to rust and have been following the official book that they provide on their site. During chapter 2 they tell you to import a "Rand" cargo which I did. However, when I try to run my code directly through VS Code I get an error saying "unresolved import rand". When I run it through command prompt, everything works fine. I've already tried every solution suggested here: https://github.com/rust-lang/rls-vscode/issues/513 and nothing seemed to have worked. Extensions that I'm using:

• Better TOML
• Cargo
• Code Runner
• Rust (rls)
• Rust Assist
• vsc-rustfmt
• vscode-rust-syntax

Has anyone else ran into a similar problem or a know a solution? Thank you!

Edit: My Cargo.TOML looks like this:

[package]
name = "guessing_game"
version = "0.1.0"
authors = ["Name <MyNameHere@gmail.com>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
rand = "0.6.0"

Edit 2: my main.rs file looks like this:

use rand::Rng;
use std::io;
use std::cmp::Ordering;

fn main()
{
    println!("Guess the number!");
    let secret_number = rand::thread_rng().gen_range(1, 101);
    loop
    {
        println!("Please input your guess!");
        let mut guess = String::new();
        io::stdin().read_line(&mut guess).expect("Failed to read line!");
        let guess: u32 = match guess.trim().parse()
        {
            Ok(num) => num,
            Err(_) => continue,
        };
        println!("Your guess {}", guess);
        match guess.cmp(&secret_number)
        {
            Ordering::Less => println!("Too small!"),
            Ordering::Greater => println!("Too big!"),
            Ordering::Equal =>
            {
                println!("You win!");
                break;
            }
        }
    }
}