correct to 0.11.0 builtin function names

[aoscodes]

looks like there are some references to out of date builtin function names in this exercise

[chrboesch]

looks like there are some references to out of date builtin function names in this exercise

No, I've checked it now, and everything is fine, look at: intFromEnum
I think you looked at the documentation from v0.10. This is what happens when you just follow the link from the zig homepage.