input: Write a function to extract the names of students from a list of dictionaries.
  assert extract_student_names([
    {'name': 'John Doe', 'age': 18, 'grade': 'A'},
    {'name': 'Jane Smith', 'age': 16, 'grade': 'B'}
  ]) == ['John Doe', 'Jane Smith']
  assert extract_student_names([
    {'name': 'Alice Johnson', 'age': 19, 'grade': 'C'},
    {'name': 'Bob Brown', 'age': 17, 'grade': 'A'}
  ]) == ['Alice Johnson', 'Bob Brown']
  assert extract_student_names([]) == []
output: def extract_student_names(students):
      return [student['name'] for student in students]