Write a C program to calculate the total size of the files in a directory and the sub-directories of the directory. 

Ok.

What have you come up with so far?

It should be straight forward, have you worked out the logic involved?

If you were personally tasked with counting contents of a large box that might include other boxes, etc., what is the process?

https://www.experts-exchange.com/questions/21046070/Recursive-processing-of-subdirectories.html?anchorAnswerId=11457702#a11457702
 this post should help you get you started. It has some key functions that are necessary for you to traverse the directory tree structure. Code may not be exactly what you want, but some functions such as dirent and readdir may prove useful to you .

while ((dirent = readdir(dir)) != NULL)      /* until read hits EOF */
 {
   if (errno == EBADF)                             
    /* if NULL happens because of error, not EOF */
     syserr("readdir");                                /* report error and exit */
   if (dirent->d_name[0] != '.')                 /* don't store as files anything staring with '.' */
    {    
      file_path = create_path(dirent->d_name);  /* create full pathname for file */
      get_file_info(file_path, dirent->d_name, statbuf, passwd);
                                                                /* store the file info */       
       insert_ok = insert_ordered(lp, file);  /* insert files onto list sorted by filename */  
    }         /* end if */     
  } 

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Here is what I have so far:

#include <stdio.h>
#include <sys/stat.h>
#include <dirent.h>
#include <ctype.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include<sys/syscall.h>
size_t getFilesize(const char* filename){
    struct stat st;
    return st.st_size;
}
int main(int argc , char *argv[]){
    char* directory = argv[1];
    struct dirent *de;
    
   
    DIR *dr = opendir(directory);
    
    if(dr == NULL) printf("Could not open current directory"); 
    
    while(de = readdir(dr)){
        printf("%s\t%lu\n", de->d_name, getFilesize(de));
    }
    
    closedir(dr);
    
    return 0;
}

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This is the error that I get:

the last block of error is the recent one

Do you need only the total size of the to
I.e. Calculate thisdirectory
thisdirectory 456789654

Your current approach would yield a single pass Once the errors of type mismatch are corrected.

You shoukd either use iterative or recursive function to which a directory is passed, and the data from file sizes are summed into ...

I.e you should also test to make sure you are given a directory and not a file.