add error handling for tasks

lib/src/replica.rs

@@ -1,3 +1,4 @@
+use crate::util::err_to_tcstring;
 use crate::{result::TCResult, status::TCStatus, string::TCString, task::TCTask, uuid::TCUuid};
 use taskchampion::{Replica, StorageConfig, Uuid};
 
@@ -75,10 +76,6 @@ impl From<Replica> for TCReplica {
     }
 }
 
-fn err_to_tcstring(e: impl std::string::ToString) -> TCString<'static> {
-    TCString::from(e.to_string())
-}
-
 /// Utility function to allow using `?` notation to return an error value.  This makes
 /// a mutable borrow, because most Replica methods require a `&mut`.
 fn wrap<'a, T, F>(rep: *mut TCReplica, f: F, err_value: T) -> T