1- Prompts the user for a social security number in the format xxx-xx-xxxx and using CharAt() and isDigit method returns valid SSN or invalid SSN
2-Enter two strings and checks if the second string is a substring of the first one.
3-Get a three digit integer (99<x<1000). add all digits and return sum of digits. if error return -1. (Must use % operator)
4- prompt for a positive-three-digit integer. check if its palindrum. if so return palindrum. if not return Not Palindrum (three digit number is palindrum if number/100 is equal to number%10)
5-prompt user to enter , distance to drive, fuel efficiency of the car in miles per gallon, price of gallon of gas. display the cost of the trip.
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