Refactored the whole code to a better structure

project/src/errors.rs

@@ -0,0 +1,33 @@
+use bcrypt::BcryptError;
+use diesel::result;
+use std::fmt;
+
+pub enum CustomError {
+    HashError(BcryptError),
+    DBError(result::Error),
+    PasswordMatchError(String),
+    PasswordWrong(String),
+}
+
+impl From<BcryptError> for CustomError {
+    fn from(error: BcryptError) -> Self {
+        CustomError::HashError(error)
+    }
+}
+
+impl From<result::Error> for CustomError {
+    fn from(error: result::Error) -> Self {
+        CustomError::DBError(error)
+    }
+}
+
+impl std::fmt::Display for CustomError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            CustomError::HashError(error) => write!(f, "{}", error),
+            CustomError::DBError(error) => write!(f, "{}", error),
+            CustomError::PasswordMatchError(error) => write!(f, "{}", error),
+            CustomError::PasswordWrong(error) => write!(f, "{}", error),
+        }
+    }
+}