Challenge.groovy

// isPalindrome - ignore cases, spaces and punctuation
// Empty string is false
// O(1) space, cant modify original string
 
[1,2,3,4,5,6].each {
    println "Running isPalindrome${it}"
    assert !"isPalindrome${it}"("")                        // False
    assert !"isPalindrome${it}"(" !,! ")                   // False
    assert "isPalindrome${it}"("M")                        // True
    assert "isPalindrome${it}"("MM..M")                    // True
    assert "isPalindrome${it}"("Madam!  I'm... Adam!!!!!") // True
}
 
// Assume you have this method available
def isAlphaNumeric(c) {
    c ==~ "[A-Za-z0-9]"
}