Hi everyone, I'm new to this site and hope you might be able to help me out?
So I've been given an assignment to produce this output:

% ./hw3b foo
slow foo but foo sure
% ./hw3b XYZ123
slow XYZ123 but XYZ123 sure
% ./hw3b 'stinky junk'
slow stinky junk but stinky junk sure

using asm to insert the word/phrase, and only these libraries: stdlib.h, stdio.h, & string.h.
I've already done most of the the C coding (shown below) I think, but I'm stuck on the asm assembler code insertion.

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
 
char word[] = "here and there";
int sz;
int wordsz;
char *arg;
char *result;
 
int main(int argc, char* argv[]) {
   if (argc != 2) {
     printf("Usage: %s takes one string argument.\n", argv[0]);
     exit(1);
   }
 
   sz = strlen(argv[1]) + 1;
   arg = malloc(sz);
   strcpy(arg, argv[1]);
   wordsz = strlen(word) + 1;
   result = malloc(sz * wordsz);
 
   __asm__("\n\
     \*In here will be a loop which will use iter
       to iterate one char (byte) at a time.
       When it comes upon a space char it will exit
       to the print statement, but when it comes
       upon a newline, it will ret and exit*\
");
   //I'm thinkin of something like this, where temp_save is there
   //to save the index of the beginning of the last word to
   //provide a range ([temp_save,iter]) for strncpy()
   //So essentially this will copy the correct range out of word
   //and append it (followed by the keyword arg) onto result
   strcat(result,"%s %s",strncpy(result,word+temp_save,iter),arg);
   temp_save=iter;
 
   __asm__("\n\
     \*If newline delimiter not reached, return to
       previous loop*\
");
   printf("%s\n", result);
   return 0;
}

---

Herein lies my issue: how can I detect a space (' ') char using assembly?