Add version string, bump version

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libshabal"
-version = "1.2.0"
+version = "1.3.0"
 authors = ["Harry Phillips <[email protected]>"]
 edition = "2018"
 build = "build.rs"

src/lib.rs

@@ -7,6 +7,8 @@ use std::os::raw::c_void;
 use pocc::plot::NONCE_SIZE;
 use pocc::plot::SCOOP_SIZE;
 use crate::simd::SimdExtension;
+use std::ffi::CString;
+use once_cell::sync::Lazy;
 
 mod pocc;
 mod simd;
@@ -115,6 +117,15 @@ cfg_if! {
     }
 }
 
+static VERSION: Lazy<CString> = Lazy::new(|| {
+    return CString::new("v1.3.0").expect("Failed to create version string");
+});
+
+#[no_mangle]
+pub extern fn libshabal_version() -> *const u8 {
+    return VERSION.as_ptr() as *const u8;
+}
+
 #[no_mangle]
 pub extern fn shabal_findBestDeadlineDirect(
     scoops: *const u8,