How to convert Vec to row! macro

[kingmo888]

Hello, I'm using your package to try to write something that calls rust code through python. It will be used to convert Python's pandas into a list and then save it as excel. Because pandas excel is too slow.
However, problems were encountered at the beginning,
I created a set of data (data<Vec<Vec<String>>>), like excel's rows，but I don't how to convert Vec to row! macro

data:
[ [ "a1", "b2", "c3", "d4", "e5", ], [ "11", "12", "13", "14", "15", ], [ "21", "22", "23", "24", "25", ], [ "31", "32", "33", "34", "35", ], ]

function is

fn build_data()->Vec<Vec<String>>{
    let s = "".to_string()
        + "a1,b2,c3,d4,e5\n"
        + "11,12,13,14,15\n"
        + "21,22,23,24,25\n"
        + "31,32,33,34,35";
    
    let s_v:Vec<String> = s.split('\n').map(|x| x.to_string()).collect();
    let mut v:Vec<Vec<String>> = Vec::new();
    for s1 in s_v{
        let s1:Vec<String> = s1.split(',').map(|x| x.to_string()).collect();
        v.push(s1);
    
    }
    v
}