public void Test1()
{
var input = "dabAcCaCBAcCcaDA";
var result = Functions.Remove(input, 'a');
Assert.AreEqual("dbcCCBcCcD", result);
result = Functions.Remove(input, 'b');
Assert.AreEqual("daAcCaCAcCcaDA", result);
result = Functions.Remove(input, 'c');
Assert.AreEqual("dabAaBAaDA", result);
result = Functions.Remove(input, 'd');
Assert.AreEqual("abAcCaCBAcCcaA", result);
}