input: Write a python function to create a class `Example`, initialize it with three attributes `a`, `b`, and `c`, and add a method to print these values.
  assert Example(10, 20, 30).print_values() is None
  assert Example(1, 2, 3).print_values() is None
  assert Example(100, 200, 300).print_values() is None
output: class Example:
      def __init__(self, a, b, c):
          self.a = a
          self.b = b
          self.c = c
  
      def print_values(self):
          print(self.a, self.b, self.c)