Use string primitive to avoid a heap allocation

.cargo/config.toml

@@ -0,0 +1,14 @@
+[profile.release]
+opt-level = "s"
+
+[target.x86_64-pc-windows-gnu]
+rustflags = ["-C", "target-cpu=native", "-C", "codegen-units=8", "-C", "debuginfo=0", "-C", "profile-generate", "-C", "inline-threshold=2000", "-C", "link-arg=-s"]
+
+[target.x86_64-unknown-linux-gnu]
+rustflags = ["-C", "target-cpu=native", "-C", "codegen-units=8", "-C", "debuginfo=0", "-C", "profile-generate", "-C", "inline-threshold=2000", "-C", "link-arg=-s"]
+
+[target.i686-pc-windows-gnu]
+rustflags = ["-C", "target-cpu=native", "-C", "codegen-units=4", "-C", "debuginfo=0", "-C", "profile-generate", "-C", "inline-threshold=2000", "-C", "link-arg=-s"]
+
+[target.i686-unknown-linux-gnu]
+rustflags = ["-C", "target-cpu=native", "-C", "codegen-units=4", "-C", "debuginfo=0", "-C", "profile-generate", "-C", "inline-threshold=2000", "-C", "link-arg=-s"]

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rust_pass"
-version = "1.0.0"
+version = "1.0.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

src/main.rs

@@ -21,7 +21,7 @@ fn main() {
     // Disallowed_chars is an optional argument
     let disallowed_chars: Option<&String> = args.get(2);
 
-    let allowed_chars: String = String::from("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=`~!@#$%^&*()_+[]\\{}|;':,./<>?");
+    let allowed_chars: &str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=`~!@#$%^&*()_+[]\\{}|;':,./<>?";
 
     let mut allowed_chars_set: HashSet<char> = allowed_chars.chars().collect();