Will someone help me write this function in c++?

// REQUIRES: img points to a valid Image // 0 <= row && row < Image_height(img) // 0 <= column && column < Image_width(img) // MODIFIES: *img // EFFECTS: Sets the pixel in the Image at the given row and column // to the given color. void Image_set_pixel(Image* img, int row, int column, Pixel color)

This is from the .h file and is the struct

struct Image { int width; int height; Matrix red_channel; Matrix green_channel; Matrix blue_channel;