Functions for operating on strings are provided with the standard C library; however, we would like to be able to treat strings in our programs as if they were a built-in type. Thus, in this exercise you are to develop a software package in C that implements the STRING ADT. This ADT should at the minimum support the following operations:1.Retrieve(i, s). Returns element iof string s.2.Print(s). Prints the contents of string s.3.Concatenate(s1, s2). Concatenates strings s1and s2and returns the resulting string.4.Copy(s1, s2). Copies the contents of string s1to string s2.5.Compare(s1, s2). Compares string s1to string s2, returning a result indicating whether or not s1is lexicographically greater than s2.6.Length(s). Returns the number of characters in the string s.7.Capacity(s). Returns the maximum numbers of characters that can be stored in the string s.