docs(print-and-consume): add description of exercise

subjects/print-and-consume/README.md

@@ -1,20 +1,25 @@
-## print_and_consume
+## own_and_return
 
 ### Instructions
 
-Create a function `print_and_consume` which takes a `String`, print the string with a new line at the end and consume it (the string can't be used after the function is called).
+Create a function `only_return` that takes a `struct` Film that has one Field of type `String` and returns the string without owning it.
 
-Create a function `only_print` that takes a `String` and print it with a new line without consuming it.
+Create a function `own_and_return` which takes ownership of the struct, and returns the string.
 
 ### Expected functions
 
 ```rust
-pub fn print_and_consume(argument) {
+pub struct Film {
+    pub name: String,
 }
 
-pub fn only_print(argument) {
+pub fn only_return(your_parameter) {
 }
 
+pub fn own_and_return(your_parameter) {
+}
+
+
 ```
 
 ### Usage
@@ -22,15 +27,16 @@ pub fn only_print(argument) {
 Here is a possible program to test your function :
 
 ```rust
-use print_and_consume::*;
+use own_and_return::*;
-
-fn main() {}
-```
 
-And its output:
+pub struct Film {
-
+    pub name: String,
-```console
+}
-$ cargo run
 
-$
+fn main() {
+     println!("{}",  own_and_return(your_argument);
+     println!("{}",  only_return(your_argument);
+}
 ```
+
+And its output should return the name of the film being passed.