Below is my assignment for C language. please give me the correct program. Thanks a lot for your help!

Below is format_str()

Below is mod_str()

Below is sort_str()

Program 11b Create a program that prints a class roll sheet in alphabetical order. The user inputs the students' first name and last names (separately!), and presses enter on the first name when done. The program prints out the roster like this... HATFIELD, HEIDI KAISER, RUSSELL LIPSHUTZ, HOWARD PENKERT, DAWN WRIGHT, ELIZABETH Before starting, carefully study sort_str0, mod_str), and format0. Make a copy of sort-str() and rename it roll(). Also, change stsrt0 to stsrt20Compile and make sure it works from maino. Change limit] to represent first name. The input should work for 30 students and first name should be 15 characters. Change prompts as needed. Compile and test. Make changes to convert the first name to all upper case using a function from mod_str(). Add another array and get input for last name which will also be an array of 30 with 15 characters. Combine last and first into an third array. You may use sprintf0 for this one. There are other ways. Program 11b Create a program that prints a class roll sheet in alphabetical order. The user inputs the students' first name and last names (separately!), and presses enter on the first name when done. The program prints out the roster like this... HATFIELD, HEIDI KAISER, RUSSELL LIPSHUTZ, HOWARD PENKERT, DAWN WRIGHT, ELIZABETH Before starting, carefully study sort_str0, mod_str), and format0. Make a copy of sort-str() and rename it roll(). Also, change stsrt0 to stsrt20Compile and make sure it works from maino. Change limit] to represent first name. The input should work for 30 students and first name should be 15 characters. Change prompts as needed. Compile and test. Make changes to convert the first name to all upper case using a function from mod_str(). Add another array and get input for last name which will also be an array of 30 with 15 characters. Combine last and first into an third array. You may use sprintf0 for this one. There are other ways