You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: repo_config.go
    path of file: ./repos/teller/vendor/github.com/DopplerHQ/cli/pkg/controllers
    
    the code of the file until where you have to start completion: /*
Copyright Â© 2020 Doppler <support@doppler.com>

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 un
    
func RepoConfig() (models.RepoConfig, Error) {

	repoConfigFile := filepath.Join("./", repoConfigFileName)
	ymlRepoConfigFile := filepath.Join("./", ymlRepoConfigFileName)

	if utils.Exists(repoConfigFile) {
		utils.LogDebug(fmt.Sprintf("Reading repo config file %s", repoConfigFile))

		yamlFile, err := ioutil.ReadFile(repoConfigFile) // #nosec G304

		if err != nil {
			var e Error
			e.Err = err
			e.Message = "Unable to read doppler repo config file"
			return models.RepoConfig{}, e
		}

		var repoConfig models.RepoConfig

		if err := yaml.Unmarshal(yamlFile, &repoConfig); err != nil {
			var e Error
			e.Err = err
			e.Message = "Unable to parse doppler repo config file"
			return models.RepoConfig{}, e
		}

		return repoConfig, Error{}
	} else if utils.Exists(ymlRepoConfigFile) {
		utils.LogWarning(fmt.Sprintf("Found %s file, please rename to %s for repo configuration", ymlRepoConfigFile, repoConfigFileName))
	}
	return models.RepoConfig{}, Error{}
}