codefights arcade intro task 11
isLucky https://
isLucky https://
extraNumber https://
add https://
knapsackLight https://
digitDegree https://
centuryFromYear https://
findEmailDomain https://
isIPv4Address https://
shapeArea https://
chessKnight https://
deleteDigit https://
checkPalindrome https://
variableName https://