The official casing is AFLplusplus
MODIFY
.gitmodules
.gitmodules
[submodule "unicorn_mode/unicornafl"]
path = unicorn_mode/unicornafl
- url = https://github.com/aflplusplus/unicornafl
+ url = https://github.com/AFLplusplus/unicornafl
[submodule "custom_mutators/grammar_mutator"]
path = custom_mutators/grammar_mutator/grammar_mutator
url = https://github.com/AFLplusplus/Grammar-Mutator

The official casing is AFLplusplus