fix(sprint-2): add missing parameter to getLastDigit function

Author: Tarawally

Sprint-2/2-mandatory-debug/2.js

@@ -2,6 +2,7 @@
 
 // Predict the output of the following code:
 // =============> Write your prediction here
+// All outputs will be "3" because function has no parameter and always uses global num (103)
 
 const num = 103;
 
@@ -15,10 +16,20 @@ console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
 // Now run the code and compare the output to your prediction
 // =============> write the output here
+// The last digit of 42 is 3
+// The last digit of 105 is 3
+// The last digit of 806 is 3
+
 // Explain why the output is the way it is
 // =============> write your explanation here
+// Bug: Function has no parameter, so arguments (42, 105, 806) are ignored. Always uses global num (103)
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice
+
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+function getLastDigit(number) {
+  return number.toString().slice(-1);
+}
 
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem