added clear function as optional subcommand to stack command

src/config.rs

@@ -0,0 +1,51 @@
+//! handle the config file and bookmarks stored
+//! in said config file
+
+use std::fs;
+use std::fs::File;
+use std::io::{Error, ErrorKind, Result};
+use std::path::{Path, PathBuf};
+use std::str::FromStr;
+use sysinfo::{Pid, System};
+
+const config_dir_path: &str = "~/.config/navigate/";
+
+#[derive(Debug, Clone)]
+pub struct Config {
+    pub bookmarks: Vec<PathBuf>,
+}
+
+impl Config {
+    /// generates and populates a new instance of Config
+    pub fn new() -> Result<Self> {
+        let mut config = Config {
+            bookmarks: Vec::<PathBuf>::new(),
+        };
+
+        // stack.build_stack()?;
+        if !config.bookmarks[0].is_dir() {
+            config.bookmarks.remove(0);
+        };
+
+        Ok(config)
+    }
+
+    pub fn build_config(&mut self) -> Result<()> {
+        let config_dir = match PathBuf::from_str(config_dir_path) {
+            Ok(result) => result,
+            Err(_) => return Err(Error::other("failed to create path object for config file")),
+        };
+
+        let mut bookmark_file = config_dir.clone();
+        bookmark_file.push("bookmarks.conf");
+
+        if !bookmark_file.is_file() {
+            _ = File::create(bookmark_file.clone())?;
+        }
+        
+        let mut bookmarks = fs::read_to_string(bookmark_file.clone())?;
+        // TODO: parse bookmarks
+
+        Ok(())
+    }
+}