Fuzz introspector: fuzzerIndexIO
For issues and ideas: https://github.com/ossf/fuzz-introspector/issues

Fuzzer calltree

0 LLVMFuzzerTestOneInput [function] [call site] 00000
1 h3ToString [function] [call site] 00001
2 sprintf [call site] 00002
1 stringToH3 [function] [call site] 00003
2 __isoc99_sscanf [call site] 00004