process NORMALISE {
    tag "$vcf.simpleName"
    input:  path vcf
    output: path "${vcf.simpleName}.norm.vcf.gz", emit: vcf

    script:
    """
    bcftools norm -m -both -Oz -o ${vcf.simpleName}.norm.vcf.gz $vcf
    bcftools index -t ${vcf.simpleName}.norm.vcf.gz
    """
}