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Here’s an example code snippet that demonstrates the usage of `to_lowercase()` in Rust:
let my_string = String::from("HELLO WORLD");
let lowercase_string = my_string.to_lowercase();
In this example, we create a new `String` object with the value “HELLO WORLD”. We then call the `to_lowercase()` method on this object, which returns a new `String` object with the value “hello world”. Finally, we print the lowercase string to the console using the `println!()` macro.
It’s important to note that the `to_lowercase()` method returns a new `String` object and does not modify the original string. If you want to modify the original string, you can use the `to_lowercase_mut()` method instead.