Function replace_first_n_with_zero

bitvm/src/chunk/helpers.rs:92–102

(hex_string: &str, n: usize)

    }

    fn replace_first_n_with_zero(hex_string: &str, n: usize) -> String {
        let mut result = String::new();

        if hex_string.len() <= n {
            result.push_str(&"0".repeat(hex_string.len())); // If n >= string length, replace all
        } else {
            result.push_str(&"0".repeat(n)); // Replace first n characters
            result.push_str(&hex_string[0..(hex_string.len() - n)]); // Keep the rest of the string
        }
        result
    }

    fn extern_hash_fp_var(fqs: Vec<[u8; 64]>) -> [u8; 64] {
        let mut vs = Vec::new();