What would be the simplest way to remove additional occurences of consecutive spaces in a file name?

For example, if I have a file Test File.zip, where only one space is between Test and File, this is ok. But, if I have two spaces between Test and File, I need to preserve only one. However, there could be several occurences of such situation in the same file name, where some sequences could have one, two or more spaces. So, I am looking to know if that could be adjusted within one command?