WRITTEN IN C

2. (10 points) Write a function unsigned int count vowels (char *str) that accepts a null terminated string and prints the number of vowels in the string. Both lower and upper case vowels must be counted. The function must not modify the input string. Sample input and expected output: 2 str Expected return value "Hello World" 3 9999 0 "abcdefghijklmnopqrstuvwxyz" 5