Writing invoice generator

Hello. Already posted on #Linux , I was searching for a simple open source invoice writer. Tried GnuCash, looked at other programs like hledger, crater and InvoiceNinja. The latter 3 all require you to set up a web server, which I do not want. Instead, I now want to try and write my own invoice generator in C (why C? I got gcc/cmake running on Linux and Im only comfortable enough in C# and C). Do any of you people know how viable C would be for such a job? With a lot of searching online, I could also use bash for this, however I do not know whether that would be any better. If C is indeed what you recommend me to use, what libraries should I use? Thanks in advance!