refactor(core): move BlockHash::as_ref implementation to main impl block

Author: alexanderwiederin

src/core/block.rs

@@ -60,6 +60,10 @@ impl BlockHash {
             Ok(BlockHash { inner })
         }
     }
+
+    pub fn as_ref(&self) -> BlockHashRef<'_> {
+        unsafe { BlockHashRef::from_ptr(self.inner as *const _) }
+    }
 }
 
 impl AsPtr<btck_BlockHash> for BlockHash {
@@ -272,12 +276,6 @@ impl Block {
     }
 }
 
-impl BlockHash {
-    pub fn as_ref(&self) -> BlockHashRef<'_> {
-        unsafe { BlockHashRef::from_ptr(self.inner as *const _) }
-    }
-}
-
 impl AsPtr<btck_Block> for Block {
     fn as_ptr(&self) -> *const btck_Block {
         self.inner as *const _