Function ss 

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

What: Extract a string value from a JSON object by key with fallback keys.

Inputs:

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

Output:

• Returns the first string value found, or an empty string if none found.

Details:

• Tries each key in order until one returns a string value.