new to C , error C2371: 'error" : redefinition; diffrent basic types

Hello, i've to submit this assigment in few hours and i'm very nervous,
it's sort of Gas Station managing programs, handeling input files, and printing results...
it's only 1 .c file and that's my first code lines, which defines the structs:

Code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>



struct Gas_Station *pgasStationHead = NULL;
typedef struct Gas_Station {
  	char *name;
  	double octan95SS;
	double octan95FS;
	double octan98SS;
	double octan98FS;
	double gasSoldTotal;
	double gasSoldSS;
	double gasSoldFS;
	struct Gas_Station* pgasStationNext;
	struct Client_List* pclientHead;
} Station;
  
typedef struct Client_List {
  	char carID[10];
	char gasType[3];
  	double gasAmount;
	char serviceType[12];
	struct Client_List* pclientNext;
} Client;

and those are the problematic functions and the main :

Code:

void CommandsSwitch(char *orders)	{
	FILE *input , *output;
	input = fopen(orders, "rt");
	output = fopen("result.txt" , "wt");
	if (input == NULL)	{
			error("can't open file, might not exists");
	}
	else if	(output == NULL)	{
			error("can't open file");
	}
	else	{
		do	{
			int i;
			char *ptemp, *pfuncNum, *pcarID , *pstationName;
			
			ptemp = fgets(ptemp , 80 , input);
			if (ptemp[0] != '#')	{
				pfuncNum = strtok(ptemp , ",");
				i = (int)pfuncNum[0];
				switch (i)
				{
					case 1:
					HowMuchGasPerStation(output);
					break;
					
					case 2 :
					pstationName = strtok(pstationName , ",");
					AverageGasInSpecieficStation(output , pstationName);
					break;
					
					case 3 :
					HowMuchGasInAllStations(output);
					break;
					
					case 4 :
					HowMuchGasFSInAllStations(output);
					break;
					
					case 5 :
					pcarID = strtok(ptemp , ",");
					HowMuchGasSoldByCarID(output , pcarID);
					break;
					case 6 :
					pcarID = strtok(ptemp , ",");
					pstationName = strtok(pstationName , ",");
					HowMuchGasSoldByStationPerCarID(output , pcarID , pstationName);
					break;
					case 7 :
					pcarID = strtok(ptemp , ",");
					StationsWithClientByCarID(output , pcarID);
					break;
					case 8 :
					pcarID = strtok(ptemp , ",");
					pstationName = strtok(pstationName , ",");
					HowMuchClientSpentByStation(output , pcarID , pstationName);
					break;
					case 9 :
					pcarID = strtok(ptemp , ",");
					HowMuchClientSpentInTotalByCarID(output , pcarID);
					break;
					
					case 10 :
					pstationName = strtok(pstationName , ",");
					ClientDetailsBySpecieficStation(output , pstationName);
					break;
				}
			}
		}while(!feof(input));	
	}
	fclose(input);
	fclose(output);
}

static void error(char *msg)	{
	fprintf(stderr , "Error: %s\n", msg);
	exit(1);
}

int main (int argc, char* argv[])	{
	int i;
	FILE *f;
	char *orders = argv[1];
	for (i = 2; i < argc; i++)	{
		f = fopen(argv[i] , "rt");
		if (f == NULL)	{
			error("can't open file, might not exists");
		}
		else	{
			AddStation(f);
		}
		fclose(f);
	}
	CommandsSwitch(orders);

}

now the error points to the " static void error(char *msg) " function but before that it pointed to " void CommandsSwitch(char *orders) " , the CommandsSwitch give the same error.

plz try to help and guide me, i'm confused.
tnx.

You can either mess around with figuring out what order to lay the functions out in, or you can just add some function prototypes near the top of the file.