This course provides the best approach to learn Rust, starting from the basics and advancing to complex topics. It is an introduction to Rust for beginners aspiring to become skilled Rust developers.

The word is out: developers love Rust. It's rapidly becoming a top choice for systems and embedded programmers, and the demand for Rust developers is rising. Known for its performance, reliability, and productivity—especially compared to C++—Rust is a powerful language to master. If you're a systems developer, it's a fantastic next step.
In this course, you'll learn Rust by actively engaging in coding. You’ll start with a simple "Hello world" program and cover essential concepts like arrays, strings, vectors, enums, structures, traits, generics, functions, and logic. You'll also dive into advanced topics such as lifetime and memory management.
By the end of this course, you'll have a solid foundation in Rust programming and be well-prepared to take on more advanced concepts, making it ideal for Rust beginners looking to become proficient Rust developers.

Rust Programming Language

fn test(my_str:String)-> String {
    let mut my_updated_string = "".to_string(); 
    for word in my_str.split(" "){
         if word.starts_with("c"){
             my_updated_string.push_str(word);
             my_updated_string.push(' ');
         }
        }
    my_updated_string.pop();
    my_updated_string
}
fn main(){
    let  my_str= "This is a comprehensive course in Rust programming language on Educative. Read it with full concentration to grasp the content of the course";
    println!("Original String: {}", my_str);
    let updated_string = test(my_str.to_string());
    println!("Updated String: {}", updated_string);
}

fn test() {
    let word="Rust Language";
    // replace using the replace keyword
    let replace= word.replace("Language","Programming");
    // slice a string
    let slice=&replace[0..12];
    // concatenate
    let result=format!("{}{}",slice,"Code");
    //print
    println!("{}",word);
    println!("{}",replace);
    println!("{}",slice);
    println!("{}",result);
}

### Explanation
* On **line 1**, a String object `my_str` is passed as an argument.

* On **line 2**, `my_updated_string` of type `String` is initialized with the value null. 
* On **line 3**, the string is traversed using a `for` loop that splits on whitespace using the `.split` method.
   * On **line 4 to line 7**, within the `for` loop, an `if` condition checks if the starting letter of the word (splitted on space) is `c` using the `starts_with()` method, then  
      * appends the word in `my_updated_string` on **line 5**.
      * appends the space in `my_updated_string` on **line 6**. 

* On **line 9**, the appended space at the end is removed by using the `pop` function.
* After the loop terminates the variable `my_updated_string()` is returned.



The following illustration explains the above concept:

> The string is shortened just to give you an idea of how this code executes.


## Explanation
* On **line 1**, a String object `my_str` is passed as an argument.

* On **line 2**, `my_updated_string` of type `String` is initialized with the value null. 
* On **line 3**, the string is traversed using a `for` loop that splits on whitespace using the `.split` method.
   * On **line 4 to line 7**, within the `for` loop, an `if` condition checks if the starting letter of the word (splitted on space) is `c` using the `starts_with()` method, then  
      * appends the word in `my_updated_string` on **line 5**.
      * appends the space in `my_updated_string` on **line 6**. 

* On **line 9**, the appended space at the end is removed by using the `pop` function.
* After the loop terminates the variable `my_updated_string()` is returned.



The following illustration explains the above concept:

> The string is shortened just to give you an idea of how this code executes.


This lesson gives a detailed solution review of the challenge in the previous lesson.

Introduction to Rust

Rust Programs

Rust Variables

Rust Data Types

Rust Operators

Rust if and if let Expressions

Rust Loops

Rust Functions

Rust Strings

Rust Vectors

Rust Structs

Conclusion

Rust Exam

Solution Review: Concatenate Words Starting With 'c'

Solution:

Explanation