Remove code from App.java.

src/main/java/ru/corvinella/App.java

@@ -1,35 +1,10 @@
 package ru.corvinella;
 
-import ru.corvinella.expressions.ExpressionsTree;
-import ru.corvinella.expressions.entries.SequenceExpression;
-import ru.corvinella.expressions.exceptions.ExpressionException;
-import ru.corvinella.math.Calculator;
-import ru.corvinella.math.exceptions.CalculatorException;
-import ru.corvinella.parser.Parser;
-import ru.corvinella.parser.exceptions.ParserIllegalTokenValueException;
-import ru.corvinella.parser.exceptions.ParserUnknownEntityException;
-
-import java.util.Scanner;
-
 public class App {
     /**
      * Main method for testing.
      */
-    public static void main(String[] args) throws ParserIllegalTokenValueException, ParserUnknownEntityException, ExpressionException, CalculatorException {
-        Scanner scanner = new Scanner(System.in);
-        System.out.print("Please enter an expression: ");
-
-        String expression = scanner.nextLine();
-
-        Parser parser = new Parser(expression);
-        parser.parse();
-
-        ExpressionsTree expressionsTree = new ExpressionsTree(parser.getResult());
-        expressionsTree.build();
-
-        double result = Calculator.getInstance()
-                .calculate((SequenceExpression) expressionsTree.getRoot());
-
-        System.out.printf("%s = %f%n", expression, result);
+    public static void main(String[] args) {
+        // nothing here
     }
 }