The macro that I provide will help you to automatically build a spam bridge in the Minecraft game. First, select the key you want to use to activate the macro. It is important to change the mode of operation of the macro to «Run while pressed» for its correct operation. 

The macro acts unnoticed by other players, as it simply presses keys, and does not interact directly with the game. This way you can use the macro safely and not be afraid of being suspected of using cheats.