CSC220 Programming Project #2
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Due Date: 23:55pm, Tuesday, 3/21/2023, 
          upload pj2_S2023.zip to canvas

- You need to implement LispExpressionEvaluator.java which uses Java API Stack
  See project requirements in LispExpressionEvaluator.java

- Use PJ2_Test.java to test correctness of your program

- Compile programs (you are in directory containing Readme file):
	
  javac PJ2/*.java
  javac *.java

- Run programs (you are in directory containing Readme file):

  // Run main() method tests in LispExpressionEvaluator class
  java PJ2.LispExpressionEvaluator

  // Run main test program
  java PJ2_Test