Write a function in C progarmming language that gets a string str, changes all lower case letters to * (asterisk), and all upper case letters to $ (dollar sign). All other characters remain unchanged. The function returns the total number of letters modified. int hide_letters(char* str); For example: -  If str is "12ab0", then the function changes it to "12**0", and returns 2. -  If str is "aBCDe*", then the function changes it to "*$$$**", and returns 5. -  If str is "0123&***", then the function keeps the string as is, and returns 0. -  An empty string is also a string.

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