chore: fix simple typos in code and comments (split var, whether, Extensions) (#1318)

Co-authored-by: niStee <52573120+niStee@users.noreply.github.comclear>

src/main.rs

@@ -97,9 +97,9 @@ fn run() -> Result<()> {
     }
 
     for env in opt.env_variables() {
-        let mut splitted = env.split('=');
-        let var = splitted.next().unwrap();
-        let value = splitted.next().unwrap();
+        let mut parts = env.split('=');
+        let var = parts.next().unwrap();
+        let value = parts.next().unwrap();
         env::set_var(var, value);
     }
 

src/step.rs

@@ -309,7 +309,7 @@ impl Step {
             Gem => runner.execute(*self, "gem", || generic::run_gem(ctx))?,
             Ghcup => runner.execute(*self, "ghcup", || generic::run_ghcup_update(ctx))?,
             GitRepos => runner.execute(*self, "Git Repositories", || git::run_git_pull(ctx))?,
-            GithubCliExtensions => runner.execute(*self, "GitHub CLI Extenstions", || {
+            GithubCliExtensions => runner.execute(*self, "GitHub CLI Extensions", || {
                 generic::run_ghcli_extensions_upgrade(ctx)
             })?,
             GnomeShellExtensions =>

src/steps/os/unix.rs

@@ -677,7 +677,7 @@ pub fn run_nix_helper(ctx: &ExecutionContext) -> Result<()> {
     };
 
     // We assume that if the user has set these variables, we can throw an error if nh cannot find
-    // a flake there. So we do not anymore perform an eval check to find out wether we should skip
+    // a flake there. So we do not anymore perform an eval check to find out whether we should skip
     // or not.
     #[cfg(target_os = "macos")]
     if darwin_flake_path.is_some() || fallback_flake_path.is_some() {