diff --git a/Viperit/Core/ViperitError.swift b/Viperit/Core/ViperitError.swift
index 6c3f883..6002911 100644
--- a/Viperit/Core/ViperitError.swift
+++ b/Viperit/Core/ViperitError.swift
@@ -8,7 +8,7 @@
 
 import Foundation
 
-internal enum ViperitError : Error {
+enum ViperitError : Error {
     case methodNotImplemented
     
     var description: String {
diff --git a/Viperit/Extensions/String+.swift b/Viperit/Extensions/String+.swift
index 7a77132..732eccb 100644
--- a/Viperit/Extensions/String+.swift
+++ b/Viperit/Extensions/String+.swift
@@ -12,9 +12,6 @@ extension String {
     var first: String {
         return String(characters.prefix(1))
     }
-    var last: String {
-        return String(characters.suffix(1))
-    }
     var uppercasedFirst: String {
         return first.uppercased() + String(characters.dropFirst())
     }
diff --git a/codecov.yml b/codecov.yml
index 53b04dd..5d1668a 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -1,4 +1,5 @@
 coverage:
   ignore:
+    - Viperit/Core/ViperitError.swift
     - ViperitTests/*
     - ViperitTests/Sample/*