I need help with writing a C progrm on Date Calculation

I need help to write a program that asks the user for a date in the format mm/dd/yyyy, using a custom struct to store the date information entered in memory. The program should call a custom function that adds seven days to the user's date, passing in the data in and out of the custom function using the custom struct for the dates. The program should then print out the original date entered and the date one week later. I need to enrue to format the C code correctly and include meaningful comments to explain what the code does and how it works.

Additionally,

To have a clear picture of what the program should do and the steps in the process for reaching the desired result. can you please writ in plain English what the program needs to do and describe the steps in the process to solve the problem. I would like a clear explanation of the process of solving the problem, not writing C.