Make clippy happy

src/cli.rs

@@ -59,7 +59,7 @@ impl FromStr for PublishPort {
     fn from_str(src: &str) -> Result<Self, Self::Err> {
         let parts: Vec<&str> = src.split(':').collect();
 
-        if parts[0] == "" {
+        if parts[0].is_empty() {
             return Err("Expected format: [[hostip:][hostport]:]vmport".to_string());
         }
 
@@ -93,7 +93,7 @@ impl FromStr for PublishPort {
                 let vm_port = parts[2]
                     .parse()
                     .map_err(|_| format!("'{}' is not a valid port", parts[2]))?;
-                let host_port = if parts[1] != "" {
+                let host_port = if !parts[1].is_empty() {
                     parts[1]
                         .parse()
                         .map_err(|_| format!("'{}' is not a valid port", parts[1]))?

src/qemu.rs

@@ -1,3 +1,4 @@
+use std::fmt::Write;
 use std::{
     path::{Path, PathBuf},
     process::Stdio,
@@ -192,11 +193,18 @@ pub async fn launch_qemu(
     let sshd_dropin_base64 = Base64::encode_string(sshd_dropin.as_bytes());
     let cid = qemu_launch_opts.cid;
 
-    let hostfwd: String = qemu_launch_opts
-        .published_ports
-        .iter()
-        .map(|p| format!(",hostfwd=:{}:{}-:{}", p.host_ip, p.host_port, p.vm_port))
-        .collect();
+    let hostfwd: String =
+        qemu_launch_opts
+            .published_ports
+            .iter()
+            .fold(String::new(), |mut output, p| {
+                let _ = write!(
+                    output,
+                    ",hostfwd=:{}:{}-:{}",
+                    p.host_ip, p.host_port, p.vm_port
+                );
+                output
+            });
 
     let qmp_socket_path = run_dir.join("qmp.sock,server,wait=off");
     let qmp_socket_path_str = qmp_socket_path.to_string_lossy();