Describe a function (in C) that does the following Input : an integer. Output: if that integer is 4, the function returns 7. if that integer is 7, the function returns 4. constraints: the input is SURE to be either 4 or 7. no need to validate. you are not allowed to use any condition/flow commands (if, switch, while, for, trinary operator...) you are not allowed to use any external library or import anything (like math..) you are not allowed to use %(modulu), * (multiplication)