A VCF file contains multiple vCard (contact) structures.
Please recommend a gratis tool for Windows or Android that will sort a VCF so that the output VCF has each vCard ordered alphabetically by its
N (name) or
FN (full name) field.
Preferably, the user can specify whether to sort by
FN, but this is not a requirement.
Open-source is preferred, but also not a requirement.