Fix buffer overflow for bounded sequence example (#444)

* Fix buffer overflow for bounded sequence example

Signed-off-by: Michael X. Grey <greyxmike@gmail.com>

* Allow longer characters for wstring

Signed-off-by: Michael X. Grey <greyxmike@gmail.com>

---------

Signed-off-by: Michael X. Grey <greyxmike@gmail.com>

Author: mxgrey

rclrs/message_demo/src/message_demo.rs

@@ -15,7 +15,7 @@ fn check_default_values() {
     assert_eq!(msg.float_seq_unbounded, seq![6.0]);
     assert_eq!(msg.string_member.to_string(), "Χαίρετε 你好");
     assert_eq!(msg.wstring_member.to_string(), "αντίο σου 再见");
-    assert_eq!(msg.bounded_string_member.to_string(), "äöü");
+    assert_eq!(msg.bounded_string_member.to_string(), "aou");
     assert_eq!(msg.bounded_wstring_member.to_string(), "äöü");
     assert_eq!(
         msg.string_array.clone().map(|s| s.to_string()),

rclrs/rclrs_example_msgs/msg/VariousTypes.msg

@@ -13,7 +13,7 @@ float32[] float_seq_unbounded [6.0]
 # String types
 string string_member "Χαίρετε 你好"
 wstring wstring_member "αντίο σου 再见"
-string<=3 bounded_string_member "äöü"
+string<=3 bounded_string_member "aou"
 wstring<=3 bounded_wstring_member "äöü"
 
 # Array/sequence of string type