public void WhitespaceReturnsEraserReductionOfZero(char letter)
        {
            var sut    = new Pencil();
            var result = sut.FindEraserReductionRate(letter);

            Assert.Equal(0, result);
        }
        public void CharsReturnEraserReductionOfOne(char letter)
        {
            var sut    = new Pencil();
            var result = sut.FindEraserReductionRate(letter);

            Assert.Equal(1, result);
        }