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.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bda362-311f8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bda362-311f8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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