1) A C-string is a character array with a null terminating character 1e). In this question, you are nor allowed to use any of the functions built into the C-string library (a) Write a function, append, which accepts two C-strings s and t as parameters and adds the contents of t to the end of the contents of s. Assume that s has enough space to hold the contents of f. The prototype of append is as follows:pped void append (char s[]), char t[D; (3 marks) doosh C-string s contains a single integer value embedded among other characters, e.g. t "weight = 115 kg". Write afunction, geht, whi returns the integer value stored in s. Given the example C-string, getlnt should return 115. (c) A pangram is a series of words which contains all the letters of the alphabet. The letters of the words may be in upper case or lower case. The most famous English pangram i probably The Quick Brown Fox, Jumps Over The Lazy Dog A 5 Write a function, isPangram, which accepts a C-string s as a parameter and returns true if the words in s form a pangram and false otherwise. 16 marks (d) A C-string s contains a sequence of lowercase letters of the alphabet. Write a function, longestSequence, which accepts s as a parameter and returns the length of the longest sequence of identical letters in s. For example, the function should return 6 if s is 15 marks] Total Marks: 20