NEED HELP WITH C PROGRAMMING

// Task 3

// For this function, you must return the largest power of 2 that // is less than or equal to x (which will be positive). You may // not use multiplication or some sort of power function to do this, // and should instead rely on bitwise operations and the underlying // binary representation of x. If x is 0, then you should return 0.

unsigned largest_po2_le(unsigned x) { return x; }