Remove obsoleted str_new_empty

since 58325daae3beefda13ed100782cd19a89cc68771.

../string.c:1339:1: warning: ‘str_new_empty’ defined but not used [-Wunused-function]
 1339 | str_new_empty(VALUE str)
      | ^~~~~~~~~~~~~

1 files changed, 0 insertions, 8 deletions

diff --git a/string.c b/string.c
index 9fcb74261c..6abfcd33f8 100644
--- a/string.c
+++ b/string.c
@@ -1336,14 +1336,6 @@ rb_str_new_with_class(VALUE obj, const char *ptr, long len)
 }
 
 static VALUE
-str_new_empty(VALUE str)
-{
-    VALUE v = rb_str_new_with_class(str, 0, 0);
-    rb_enc_copy(v, str);
-    return v;
-}
-
-static VALUE
 str_new_empty_String(VALUE str)
 {
     VALUE v = rb_str_new(0, 0);