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#include <stdio.h>
 
char *handle_whitespace(char *content);
 
int main(void) {
	// your code goes here
	return 0;
}
 
// function to keep only one white space between words utf8
char *handle_whitespace(char *content)
{
   // to be removed later
   setlocale(LC_ALL, "en_US.utf8");
   // calc length of *content
   int i, len = mbstowcs(NULL,content,0)+1;
 
   // will hold *content as utf8
   wchar_t unicode_content[len];
   // contain the new string 
   wchar_t *normalized_content = malloc(len * sizeof(wchar_t *));
 
   // convert char to wchar_t
   mbstowcs(unicode_content, content, len);
 
   short space_added = 0;   
   for(i=0; unicode_content[i] ; ++i){
     if(iswspace(unicode_content[i])){
	    if(!space_added) {
	      normalized_content[i] = L' ';
	      space_added = 1;
	    }
     } else {	 
         normalized_content[i] = unicode_content[i];
	     space_added = 0;
       }
    }
   normalized_content[i+1] = L'\0';
 
   // convert wchar_t back to char
   char *newstr = malloc(len * sizeof(char *));
   wcstombs(newstr,normalized_content,len * sizeof(char *));
 
   free(normalized_content);
   return newstr;
}

prog.c: In function 'handle_whitespace':
prog.c:14:4: warning: implicit declaration of function 'setlocale' [-Wimplicit-function-declaration]
    setlocale(LC_ALL, "en_US.utf8");
    ^
prog.c:14:14: error: 'LC_ALL' undeclared (first use in this function)
    setlocale(LC_ALL, "en_US.utf8");
              ^
prog.c:14:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:16:4: warning: implicit declaration of function 'mbstowcs' [-Wimplicit-function-declaration]
    int i, len = mbstowcs(NULL,content,0)+1;
    ^
prog.c:19:4: error: unknown type name 'wchar_t'
    wchar_t unicode_content[len];
    ^
prog.c:21:4: error: unknown type name 'wchar_t'
    wchar_t *normalized_content = malloc(len * sizeof(wchar_t *));
    ^
prog.c:21:4: warning: implicit declaration of function 'malloc' [-Wimplicit-function-declaration]
prog.c:21:34: warning: incompatible implicit declaration of built-in function 'malloc'
    wchar_t *normalized_content = malloc(len * sizeof(wchar_t *));
                                  ^
prog.c:21:54: error: 'wchar_t' undeclared (first use in this function)
    wchar_t *normalized_content = malloc(len * sizeof(wchar_t *));
                                                      ^
prog.c:21:63: error: expected expression before ')' token
    wchar_t *normalized_content = malloc(len * sizeof(wchar_t *));
                                                               ^
prog.c:28:6: warning: implicit declaration of function 'iswspace' [-Wimplicit-function-declaration]
      if(iswspace(unicode_content[i])){
      ^
prog.c:42:4: warning: implicit declaration of function 'wcstombs' [-Wimplicit-function-declaration]
    wcstombs(newstr,normalized_content,len * sizeof(char *));
    ^
prog.c:44:4: warning: implicit declaration of function 'free' [-Wimplicit-function-declaration]
    free(normalized_content);
    ^
prog.c:44:4: warning: incompatible implicit declaration of built-in function 'free'

Standard output is empty