initials more comfortable

initials.c

#include <stdio.h>
#include <cs50.h>
#include <ctype.h>
#include <string.h>

int main (void)
{
string s = get_string();
char f;
int len = strlen(s);
char z[len];
int i;
int k = 0;

if (s[0] != ' ')
{
   f = toupper(s[0]); 
   for (i = 1; i < len; i++)
    {
         if (s[i] != ' ' && s[i-1] == ' ')
         {
           z[k] = toupper(s[i]);
           k++;  
         }
    }
    z[k] = '\0';
    printf("%c%s\n", f , z);
}
else
{
    for (i = 1; i < len; i++)
    {
        if (s[i] != ' ' && s[i-1] == ' ')
         {
           z[k] = toupper(s[i]);
           k++;  
         }
    }
    z[k] = '\0';
    printf("%s\n", z);
}

}