public void Q1_1()
{
string[] uniqueWords = { "abcde", "kite", "padle" };
foreach (string word in uniqueWords)
{
Assert.IsTrue(DataStruct.Q1_IsUniqueChar(word), $"'{word}' should be unique!");
}
string[] commonWords = { "hello", "apple" };
foreach (string word in commonWords)
{
Assert.IsFalse(DataStruct.Q1_IsUniqueChar(word), $"'{word}' should not unique!");
}
}