Updated slice examples to show string is not required to be mutable

examples/string_split.c

@@ -1,13 +1,12 @@
 #define LAZY_IMPL
 #include "../lazy.h"
-#include <string.h>
 #include <stdio.h>
 #include <ctype.h>
 
 int isnotalpha(int x) { return !isalpha(x); }
 
 int main() {
-  char *src =  lz_cstr_dup("This is a list of words, which apparently has been referred to previously as a sentence");
+  char *src = "This is a list of words, which apparently has been referred to previously as a sentence";
   Lz_Slc s = lz_cstr_to_slc(src);
 
   Lz_Slc word;
@@ -18,8 +17,5 @@ int main() {
     ++i;
   } while(s.cnt != 0);
 
-  free(src);
-
   return 0;
-
 }