Dec2Hex function : def dec_to_hex(decimal):     hex_digits = "0123456789ABCDEF"     hex_string = ""     while decimal > 0:         hex_digit = decimal % 16         hex_string = hex_digits[hex_digit] + hex_string         decimal = decimal // 16     # Pad the hexadecimal string with zeroes to make it a multiple of 2 bytes     hex_string = hex_string.rjust((len(hex_string) + 1) // 2 * 2, "0")     # Convert the hexadecimal string to bytes     hex_bytes = bytes.fromhex(hex_string)     return hex_bytes Add unit-testing code to your Dec2Hex exercise, and then perform a Unit test of the updated Dec2Hex code.   Perform a Profile of your Dec2Hex function.   Write a function that takes a timedate object as a parameter and calculates the number of years from NOW to the time in the timedate object.

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C-string

A string is a one-dimensional array of characters that can be terminated using a null character (‘\0’). The string or character array is used to manipulate the text such as words or sentences. The \0 (termination character) is the most important in the string as it is the only method to identify the end of the string. A string can be defined as a one-dimensional array of characters; whereas, an array of strings is a two-dimensional array of characters.