fix mistakes in sayHello exercise

Author: tomdu3

Sprint-3/3-dead-code/exercise-1.js

@@ -1,13 +1,13 @@
 // Find the instances of unreachable and redundant code - remove them!
 // The sayHello function should continue to work for any reasonable input it's given.
 
-let testName = "Jerry";
+let testName; // = "Jerry"; -> we can initialize the variable without giving it a value because the testName is being reassigned later in the code. The value "Jerry" never appears in a function call.
 const greeting = "hello";
 
 function sayHello(greeting, name) {
-  const greetingStr = greeting + ", " + name + "!";
+  // const greetingStr = greeting + ", " + name + "!";  -> this line is not necessary because the returned string accomplishes the same thing, and the greetingStr is never being used. So it is redundant code and can be removed.
   return `${greeting}, ${name}!`;
-  console.log(greetingStr);
+  // console.log(greetingStr);  -> this line is never being executed because it comes after the return statement, so it never runs and can be removed.
 }
 
 testName = "Aman";