rustvla | Rust practice challenges

Beta

Rust allows structs to hold mutable references to owned data, enabling them to modify the data in-place. This requires a deep understanding of lifetimes and Rust's borrowing rules to ensure memory safety.

Your Task

In this challenge, you will implement a struct named MutableTextFinder that holds a mutable reference to a String. This struct will allow for both searching and modifying the content of the String.

The MutableTextFinder struct should provide the following functionality:

new: Creates a new instance of MutableTextFinder with the given content.
find_first: Searches for the first line containing a given keyword and returns it as an immutable reference (Option<&str>).
replace_lines: Replaces all lines containing a given keyword with a replacement string.
get_text: Returns the reference to the content.
Searches should be case-sensitive.

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// 1. Finish the struct definition
pub struct MutableTextFinder

// 2. Implement the methods for the struct

// Example usage
pub fn main() {
    let mut text = String::from("Rust is awesome\nLearning Rust\nFun with Rustaceans");
    let mut finder = MutableTextFinder::new(&mut text);

    let first = finder.find_first("Rust");
    println!("{:?}", first); // Should print: Some("Rust is awesome")

    finder.replace_lines("Rust", "Programming in Rust");
    println!("{}", finder.get_text()); // Should print the modified text
}

// 1. Finish the struct definition
pub struct MutableTextFinder

// 2. Implement the methods for the struct

// Example usage
pub fn main() {
    let mut text = String::from("Rust is awesome\nLearning Rust\nFun with Rustaceans");
    let mut finder = MutableTextFinder::new(&mut text);

    let first = finder.find_first("Rust");
    println!("{:?}", first); // Should print: Some("Rust is awesome")

    finder.replace_lines("Rust", "Programming in Rust");
    println!("{}", finder.get_text()); // Should print the modified text
}