C language self-learning, how to jump and implement?

when I read a book, I write the following code and type

.
-sharpinclude<stdio.h>
-sharpinclude<stdlib.h>

/*acb*/

void butler(void);
int main()
{
printf("a");  //a
butler();     //void butler
printf("b");  //b
return 0;
}
void butler();
{
printf("c");  //c
}

I can"t go down and execute void butler (); to solve the problem first. If you can tell me in a simple sentence, thank you

C cPP
Mar.05,2021

void butler (); has an extra semicolon


Line 15, after multiple butler () ; , just remove it

-sharpinclude<stdio.h>
-sharpinclude<stdlib.h>

/*acb*/

void butler(void);
int main()
{
printf("a");  //a
butler();     //void butler
printf("b");  //b
return 0;
}
void butler() 
{
printf("c");  //c
}

learn to read compilation error prompts, and google if you don't understand.

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