Please use C language(not C++ or Java), write code base on the requirement blow:

a) (10 pts) Given an array, A, of strings and the number, N, of strings in the array, return one string that is the concatenation of all these strings. You can assume that the max length for the input strings is 20 and that at most 50 strings would be given as input. You can write helper functions You can write your own function to copy strings or use the C provided one. If you use the C library one, assume it copies a string character by character (not as a large block of memory) b) What is the time complexity of your function? If the max length of a string and the max number of strings affect your time complexity, use L_max and N max for them