fix bug

Author: golangboy

src/utils.rs

@@ -9,7 +9,7 @@ pub async fn get_all_ipv4() -> Result<Vec<String>, Box<dyn std::error::Error>> {
     let file = std::fs::File::open("cloudflare_ipv4.txt").unwrap();
     let mut reader: std::io::BufReader<std::fs::File> = std::io::BufReader::new(file);
     reader.read_to_string(&mut cidr_strings).unwrap();
-    let cidr_list = cidr_strings.split("\n");
+    let cidr_list = cidr_strings.lines();
     let mut ipv4_addresses = Vec::<String>::new();
     for cidr in cidr_list {
         let network: Ipv4Network = cidr.parse().unwrap();