public void CharacterSwapFourthTest()
{
string input = "";
Assert.AreEqual("", CharacterSwap.Vowel2Index(input));
}
public void CharacterSwapSecondTest()
{
string input = "Codewars is the best site in the world";
Assert.AreEqual("C2d4w6rs 10s th15 b18st s23t25 27n th32 w35rld", CharacterSwap.Vowel2Index(input));
}
public void CharacterSwapThirdTest()
{
string input = "Tomorrow is going to be raining";
Assert.AreEqual("T2m4rr7w 10s g1415ng t20 b23 r2627n29ng", CharacterSwap.Vowel2Index(input));
}
public void CharacterSwapFirstTest()
{
string input = "this is my string";
Assert.AreEqual("th3s 6s my str15ng", CharacterSwap.Vowel2Index(input));
}