To create a string in Rust, you can use the String type which represents a growable string. Here's an example of how to create a string in Rust:
// Create an empty string
let my_string = String::new();
// Create a string with initial value
let my_string = String::from("Hello, world!");
// Concatenate two strings
let hello = String::from("Hello, ");
let world = String::from("world!");
let my_string = hello + &world;
// Append a character to a string
let mut my_string = String::from("Hello");
my_string.push(' ');
// Append a string to a string
let mut my_string = String::from("Hello");
let world = String::from(", world!");
my_string.push_str(&world);
In the code above, we create a string my_string with different methods. First, we create an empty String with String::new(). Second, we create a string with an initial value using String::from(). Third, we concatenate two strings using the + operator. Note that we need to use &world to get a reference to the second string because the + operator takes ownership of the first string. Fourth, we append a character to a string using the push() method. And fifth, we append a string to a string using the push_str() method.