6. [10 pts] Implement the following function RECURSIVELY:

int countCharInString(char* str, char value)

//Precondition: A valid Cstring containing only letters of the alphabet in either lower or upper case and a char value that is a letter of the alphabet in either lower or upper case

//Postcondition: The number of occurrences of the given alphabet in the Cstring. The count should be insensitive to case as in all the previous questions.

C++ please