Handlebar - how to pass a string as an argument to the helper and get same string

Hi, Could anyone help? I need the entire string, not the very first element.

{{#addPin ../meta.url file "ss rr"}}{{this}}{{/addPin}}

addPin: (var_a, var_b, var_c, options) => {
    let out = var_c;
    return options.fn(out);
}