c: +1 failing test: single binary expression
c: +1 test pass: single binary expression
c: +3 failing tests: operators -,* and /
c: +3 test pass: operators -,* and /
+1 failing test: three operands expression
c: refactor: implemented evaluation of more complex expressions
-c: +1 test pass three operands expression
c: +1 failing test: three operands (reverted order)
c: +1 test pass: three operands (reverted order)
+3 passing test: expressions in natural order (no priority)
c: +1 failing test: expression with parenthesis
c: +1 test pass: expression with parenthesis
c: refactor: moved evaluation of comparison evaluator
c: refactor: removed unused functions "after" and "before"