common: Remove unused code

common/maps/maps_get.go

@@ -1,31 +0,0 @@
-// Copyright 2019 The Hugo Authors. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package maps
-
-import (
-	"github.com/spf13/cast"
-)
-
-// GetString tries to get a value with key from map m and convert it to a string.
-// It will return an empty string if not found or if it cannot be convertd to a string.
-func GetString(m map[string]interface{}, key string) string {
-	if m == nil {
-		return ""
-	}
-	v, found := m[key]
-	if !found {
-		return ""
-	}
-	return cast.ToString(v)
-}