title: new to C , error C2371: 'error" : redefinition; diffrent basic types
body: <p>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</p>
  
  <pre><code>#include &lt;stdio.h&gt;
  #include &lt;string.h&gt;
  #include &lt;stdlib.h&gt;
  
  
  
  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;
  </code></pre>
  
  <p>and those are the problematic functions and the main :</p>
  
  <pre><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 &lt; 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);
  
  }
  </code></pre>
  
  <p>now the error points to the <code>static void error(char *msg)</code> function but before that it pointed to <code>void CommandsSwitch(char *orders)</code>, the <code>CommandsSwitch</code> give the same error.</p>
  
  <p>plz try to help and guide me, i'm confused.
  tnx. </p>