public static MergeStrategy getMergeStrategyOrDefault(String strategyName) {
        return MergeStrategyFactory.getMergeStrategy(
                StringUtils.isEmpty(strategyName) ? MergeStrategy.DEFAULT_STRATEGY : strategyName);
    }
Get strategy from name
@param strategyName is the name of strategy
@return MergeStrategy
plugin/src/main/java/io/jenkins/plugins/casc/yaml/MergeStrategyFactory.java