public void stringX()
{
assertEquals("Input: stringX(\"xxHxix\")", "xHix", exercises.StringX("xxHxix"));
assertEquals("Input: stringX(\"abxxxcd\")", "abcd", exercises.StringX("abxxxcd"));
assertEquals("Input: stringX(\"xabxxxcdx\")", "xabcdx", exercises.StringX("xabxxxcdx"));
assertEquals("Input: stringX(\"xKittenx\")", "xKittenx", exercises.StringX("xKittenx"));
assertEquals("Input: stringX(\"Hello\")", "Hello", exercises.StringX("Hello"));
assertEquals("Input: stringX(\"xx\")", "xx", exercises.StringX("xx"));
assertEquals("Input: stringX(\"x\")", "x", exercises.StringX("x"));
assertEquals("Input: stringX(\"\")", "", exercises.StringX(""));
}
