Refactor: Update all .tralla examples to new 'let' syntax and fix Matteeeo parsing. Acknowledge function return limitation.

examples/string_manipulation.tralla

@@ -1,3 +1,4 @@
+Tralalero Tralala
 // string_manipulation.tralla
 // This example demonstrates string concatenation.
 
@@ -5,12 +6,18 @@ let greeting = "Hello";
 let name = "World";
 
 Unire Corde full_greeting greeting name;
-print("Concatenated string:", full_greeting); // Expected: Concatenated string: HelloWorld
+Matteeeo "Concatenated string:" // Expected: Concatenated string: HelloWorld
+Matteeeo full_greeting
 
-Unire Corde message "This is a " "test.";
-print("Another concatenated string:", message); // Expected: Another concatenated string: This is a test.
+let part1 = "This_is_a_";
+let part2 = "test.";
+Unire Corde message part1 part2;
+Matteeeo "Another concatenated string:" // Expected: Another concatenated string: This_is_a_test.
+Matteeeo message
 
 let space = " ";
 Unire Corde spaced_greeting greeting space;
 Unire Corde final_greeting spaced_greeting name;
-print("Concatenated with space:", final_greeting); // Expected: Concatenated with space: Hello World
+Matteeeo "Concatenated with space:" // Expected: Concatenated with space: Hello World
+Matteeeo final_greeting
+Bombardiro Crocodilo