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function char* func_replace(char i, char j, const char* string) should return a new string that replaces every occurrence of i with j in a given string string. If there is no char of i is found, original string is printed else if it is found then see example.

E.g=====replace('a', 'u', "happy"), it should return "huppy".

without using built-in C++ string.

Also, write some test cases in functions with the following name style: [function]length__test_case_[n] where n= test case number

Have enough test cases to show the code properly works.

Please don't use ai generated answers.

Thank you.

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