I agree that reusing the same name with different capitalization is bad, but I have seen this from several developers across many different teams and several languages. These same people often have Foo(x){junk; Foo(x,y,z); more junk;} sure if it's a pass though that's fine but if you have 10 foo('s) that all have internal logic then please come up with some actual names.

Amway IMO, SortNames() and Internal/Do/LowLevel/SortNames() are almost as bad because just looking at the names it's not obvious what's going on. Yes, visually they look different which helps and consistency can make things even more readable. But, even just SortNamesHappyPath() gives some idea of what's going on.