Function ss 

pub fn ss(v: &Value, keys: &[&str]) -> Option<String>

What: Extract the first available string from a list of candidate keys.

Inputs:

• v: JSON value to extract from.
• keys: Array of candidate keys to try in order.

Output:

• Returns Some(String) for the first key that maps to a JSON string, or None if none match.

Details:

• Tries keys in the order provided and returns the first match.
• Returns None if no key maps to a string value.

Examples

use pacsea::util::ss;
use serde_json::json;

// Trying multiple possible version keys from different AUR API responses
let pkg_info = json!({
    "Version": "1.2.3",
    "pkgver": "1.2.3",
    "ver": "1.2.3"
});
// Returns the first matching key: "pkgver"
assert_eq!(ss(&pkg_info, &["pkgver", "Version", "ver"]), Some("1.2.3".to_string()));

// Trying to get a maintainer, falling back to a packager field
let maintainer_info = json!({
    "Packager": "Arch Linux Pacsea Team <pacsea@example.org>"
    // "Maintainer" key is missing to demonstrate fallback
});
assert_eq!(ss(&maintainer_info, &["Maintainer", "Packager"]), Some("Arch Linux Pacsea Team <pacsea@example.org>".to_string()));

// Returns None if no key matches
assert_eq!(ss(&pkg_info, &["License", "URL"]), None);