6. double-primes: Takes an array of integers and the length of the array as input and doubles every prime element of the array. For example, if the input array contains [1, 7, -2], then after a call to double-primes the array will contain [1, 14, -2]. 7. negate-armstrongs: Takes an array of integers and the length of the array as input and negates every element of the array that is an Armstrong number. An Armstrong number (also called a Narcissistic number) is a number that is equal to the sum of its digits each raised to the power of the number of digits. For example, 153 is an Armstrong number because it has 3 digits and 13 + 53 + 33 = 153. Thus, if an input array contains [2, -153, 153], then after a call to negate armstrongs the array will contain [2, -153, -153]. 6. double-primes: Takes an array of integers and the length of the array as input and doubles every prime element of the array. For example, if the input array contains [1, 7, -2], then after a call to double-primes the array will contain [1, 14, -2]. 7. negate-armstrongs: Takes an array of integers and the length of the array as input and negates every element of the array that is an Armstrong number. An Armstrong number (also called a Narcissistic number) is a number that is equal to the sum of its digits each raised to the power of the number of digits. For example, 153 is an Armstrong number because it has 3 digits and 13 + 53 + 33 = 153. Thus, if an input array contains [2, -153, 153], then after a call to negate armstrongs the array will contain [2, -153, -153]