移除无用的errors文件

library/src/errors.rs

@@ -1,36 +0,0 @@
-use core::fmt;
-use std::error::Error;
-
-#[derive(Debug)]
-pub struct MessageError(Option<String>);
-
-// 实现Error trait
-impl Error for MessageError {
-
-    fn cause(&self) -> Option<&dyn Error> {
-        self.source()
-    }
-
-}
-
-// 实现Display trait，这是Error trait的一部分要求
-impl fmt::Display for MessageError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match &self.0 {
-            Some(message) => write!(f, "{}", message),
-            None => write!(f, "")
-        }
-    }
-}
-
-impl From<String> for MessageError {
-    fn from(value: String) -> Self {
-        MessageError(Some(value))
-    }
-}
-
-impl From<&str> for MessageError {
-    fn from(value: &str) -> Self {
-        MessageError(Some(value.to_string()))
-    }
-}