In c#.

(a) Write a function to determine if a given string str contains a substring subStr The function should return true if subStr appears anywhere inside str, false otherwise. int strContains (const char *str, const char *subStr); (b) Write a function that takes a string s and returns a new string that contains the first character of each word in s (you may assume that words are separated by a single space) but capitalized. For example, if we call this function with the string "International Business Machines" it should return "IBM" . If we call it with the string Flint Lockwood Diatonic Super Mutating Dynamic Food Replicator" it should return "FLDSMDFR" characronymizer(const char *s); (c) Write a function that replaces instances of a given character with a different char- acter in a string. void replaceChar (char *src, char oldChar, char newChar); Which will replace any instance of the character stored in oldChar with the char- acter stored in newChar in the string src d) Write a function that takes a string and removes all instances of a certain character from it. void removeChar (char *src, char c); When removing characters, all subsequent characters should be shifted down. Take care that you handle the null terminating character properly