Using visual studio 2019 learning C

Strings 1. Write a program that identifies all the vowels in a string which is entered by a user. Eg an input string "Hello this is a string" would return "eoliai". 2: Write a program that takes all the letters of a string which is entered by a user and prints them out in reverse order. Your code should ignore any nonletters in the string. Do NOT use the strrev() function. Make sure you use meaningful variable names and that you add comments to your code. You should submit your code and a sample of the input and output in a single pdf document