Made zombie/mod.rs runnable. Works now.

hw5/task1/src/zombie/mod.rs

+use std::process::Command;
+use std::{thread, time};
+use nix::sys::signal::*;
+use nix::unistd::{fork, ForkResult};
+
+pub fn run_zombie() {
+    match fork().expect("Fork failed") {
+
+        // In case this is the Parent process, kill the new child.
+        ForkResult::Parent{ child } => {
+            kill(child, SIGKILL).expect("Kill failed");
+        },
+
+        // In case this is the Child process, wait until killed.
+        ForkResult::Child => {
+            thread::sleep(
+                time::Duration::new(5000, 0) //Wait for a long time
+            );
+        }
+    }
+
+
+    let output = Command::new("ps").arg("t").output().expect("Error in run_zombie");
+
+    println!("stdout: {}", String::from_utf8_lossy(&output.stdout));
+}