has to be in C

Create a set of functions that modify strings in various ways: O Set all characters in a string to all lower case letters Set all characters in a string to all upper case letters Toggle the case of all characters in a string Replace certain letters in a string with numbers: 0, 0, D = 0 1,1 = 1 = 2 C3 D Ah, H = 4 S = 5 o b, G=6 o I.LT=7 O o 0.00 B=B 8. Reverse the string Your functions must take a character array by reference as an argument. Use functions from the C Standard Library to help you. You may use/assume strings of 11 characters (10 characters + null character) DO NOT prompt for input: Hard code example string of your choice