有没有rust领域大神看一下，这里为什么不能借用：
error[E0413]: cannot borrow friend.wallet as mutable here
--> src/main.rs:42:13
|
42 | friend.wallet -= 50;
| ^^^^^^^^^^^^^ friend needs KFC Crazy Thursday permission
|
= note: KFC_Protocol demands:
Run cargo bless --kfc-crazy-thursday to approve ¥50 transfer.
Compensation: Lifetime supply of emoji wings (🪽) and gratitude.
Post #576
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