How to capitalize english string in Emacs

Question

I'm wondering what's people using to correctly capitalize english strings since ''capitalize'' won't do the job:

(capitalize "can't")
=> "Can'T"

Although writing this function is trivial, I'm wondering if there's a preferred built-in way to do it.

Answer 1

Maybe if you temporarily add ' to the current word constituent syntax table:

(modify-syntax-entry ?' "w")

(capitalize "can't")
=> "Can't"

Answer 2

I have M-c bound to capitalize-word, and it works to capitalize can't correctly.