Function build_query_command 

pub fn build_query_command(
    cmus_remote_bin: &str,
    socket_addr: &Option<String>,
    socket_pass: &Option<String>,
) -> Command

Build the query command. This function it should call only one time entire the program life time, So it makes sense to make it inline. This function will return a std::process::Command that can be used to query cmus, you should store it in a variable :).