Counts all words excluding double spaces

wordcounter.c

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

// dir /b /a-d

int main() {

   FILE *fp;
   const char *filetree = "filetree.txt";

   fp = fopen(filetree, "r");
   char c;
   char cstring[2] = "a";
   char fstring[2048];
   strcpy(fstring, "");
   int filenameSz = 0;

   char filenames[511][2048]; // first double array
   while (!feof(fp))
   {
       c = fgetc(fp);
       if (c == '\n' || c == '\0')
       {
           // get rid of -1 files
           int i = 0;
           while (fstring[i] != '.')
               i++;
           if (fstring[i-2] == '-' && fstring[i-1] == '1')
           {
           }
           else
           {
               strcpy(filenames[filenameSz], fstring);
               filenameSz++;
           }
           strcpy(fstring, "");
       }
       else
       {
           cstring[0] = c;
           strcat(fstring, cstring);
       }
   }
   strcpy(filenames[filenameSz], fstring);
   printf("files to read: %d\n", filenameSz);


   const char *filedir = "dir/";
   char filename[2048];

   int totalWordcount = 0;

   
   for (int i = 0; i < filenameSz; i++)
   {
       strcpy(filename, filedir);
       strcat(filename, filenames[i]);

       fp = fopen(filename, "r");
       int wordcount = 1;
       char lastSpace = 0;
       while (!feof(fp))
       {
           c = fgetc(fp);
           if (c == ' ' && lastSpace == 0)
           {
               wordcount++;
               lastSpace = 1;
           }
           else
           {
               lastSpace = 0;
           }
       }
       printf("filename:%s", filename);
       // correct indentation
       int filenameLength = 0;
       while (filename[filenameLength] != '\0')
           filenameLength++;

       for (int j = filenameLength; j < 100; j++)
           printf(" ");
           
           printf("wc: %d\n", wordcount);
       totalWordcount += wordcount;
   }
   printf("summary wc: %d\n", totalWordcount);
   fclose(fp);

   return 0;
}