Remove unneeded pub

exercises/17_tests/tests3.rs

@@ -2,7 +2,7 @@
 // the test passes. Then write a second test that tests whether we get the
 // result we expect to get when we call `is_even(5)`.
 
-pub fn is_even(num: i32) -> bool {
+fn is_even(num: i32) -> bool {
     num % 2 == 0
 }
 

exercises/17_tests/tests4.rs

@@ -7,7 +7,7 @@ struct Rectangle {
 
 impl Rectangle {
     // Only change the test functions themselves
-    pub fn new(width: i32, height: i32) -> Self {
+    fn new(width: i32, height: i32) -> Self {
         if width <= 0 || height <= 0 {
             panic!("Rectangle width and height cannot be negative!")
         }