need to program this in C - any help

this is the starter code below:

Part 2: argshift. [70 points] argshift is a program that takes a string as input, and shifts each letter in it forward by one letter (except z, which gets converted back to a). So, "abcz" should turn into "boda". This includes capital letters, but does not include non-alphabetical characetrs, such as punctuation, spaces and digits. For this, you should implement the following functions: char shift_char (char c) char* dup_shift (char* s) See the source code for more information about what each function should do. The memory space allocated for storing the return string should be dynamically allocated from the heap You should allocate the least amount of space that can still hold the result. Your code should not change the string s For this part you may use the standard library functions malloc, calloc, realloc, free and printf to manage dynamic memory allocation/deallocation and print the result After you implement the function strdup-ptr) correctly, your code should work as in the sample runs listed below: $./argshift Enter a string: Ludicrous Speed, Go! Mvejdspvt Tqffe, Hp! You should fix all memory leaks (if any) in the code. It is highly recommended that you look at an ASCII chart when doing this assignment. One may be found by running man ascii #include 3 #include 4 // return the length of a string 5 // For example, 6 // return if s is" // return 3 ifs is "abc" 8 unsigned long my_strlen(char *s) unsigned long while (*s +) return i; i-e; This should shift the 'a. to 'b', 'b' to 'c', , '2' to 'a', as well as the capital letters 19 Don 't shift non-alphabetical characters 1 char shift_char (char x)f 23 25 Returns a pointer to a new string which is 26a copy of the given string s./ 7 char dup_shift(char* s) f 28 29 0 int main(int argc, char argv[]) 2 char input[100]; 3 printf("Enter a string: ) scanf("%[^ ]s", input ) ; 5 char* dups_ptr-dup_-shift(input); printf("%s ", dups-ptr); 7 free (dups_ptr); 8 9 return 10