I created a game using raylib and C++ but I am getting the pointer issue when I load the texture

We’re trying to make a game like mahjong club but we have some problems, and we cannot figure it out how to fix it. There are major problems that we need to fix.
1-) We interact second board with double click. We should make it only 1 click.
2-) When we reach the third board we cannot play with third board. We add something to see selected tiles coordinates thus, in terminal we see only z=0 and z=1 values but we also should see z=2 coordinates.

I am using raylib, when I create a basic project, I want to make the window resizable, when I resize the window, the background is black, why is this, how can I make the window background not black.