String call(String version, String flag = 'patch') {
    List<String> versionArray = version.tokenize('.')
    int major = versionArray[0] as int
    int minor = versionArray[1] as int
    int patch = versionArray[2] as int

    switch (flag) {
        case 'major':
            major++
            minor = 0
            patch = 0
            break
        case 'minor':
            minor++
            patch = 0
            break
        case 'patch':
            patch++
            break
        default:
            echo "Warning: Invalid increment flag for version increment: $flag"
            echo 'Info: Flag value should be one of major, minor or patch.'
            return version
    }

    return "${major}.${minor}.${patch}"
}