Student Grades

Create a HashMap that maps student names to their grades:

• "Alice" got an "A"
• "Bob" got a "B"
• "Carol" got an "A"

Print each student and their grade in alphabetical order by name, in the format Name: Grade.

Expected output:

Alice: A
Bob: B
Carol: A

Hints:

• Use .insert() to add each student
• Collect keys, sort them, then loop through to print