Ошибки undefined reference при компиляции проекта на Си

C:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\Users\User\AppData\Local\Temp\cc0jziDg.o: in function `main':
c:/VsCode/Project_TempC/main.c:6: undefined reference to `addInfo'
C:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: c:/VsCode/Project_TempC/main.c:28: undefined reference to `SortByDate'
C:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: c:/VsCode/Project_TempC/main.c:29: undefined reference to `printInfo'
C:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: c:/VsCode/Project_TempC/main.c:31: undefined reference to `SortByTemp'
C:/gcc/bin/../lib/gcc/x86_64-w64-mingw32/10.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: c:/VsCode/Project_TempC/main.c:32: undefined reference to `printInfo'
collect2.exe: error: ld returned 1 exit status

$ cat temp_functions.h
void addInfo();
void SortByDate();
void printInfo();
void SortByTemp();
$ cat temp_functions.c
#include "temp_functions.h"
#include <stdio.h>
 
void addInfo(){
  printf("addInfo\n");
}
void SortByDate(){
  printf("SortByDate\n");
}
void printInfo(){
  printf("printInfo\n");
}
void SortByTemp(){
  printf("SortByTemp\n");
}
$ cat main.c
#include <stdio.h>
#include "temp_functions.h"
 
int main(){
  addInfo();
  SortByDate();
  printInfo();
  SortByTemp();
}
$ gcc main.c temp_functions.c -o prog
$ ./prog 
addInfo
SortByDate
printInfo
SortByTemp
$