string.c: remove code duplication using `str_init_modifiable()`.
MODIFY
src/string.c
src/string.c
@@ -827,12 +827,7 @@ mrb_str_to_cstr(mrb_state *mrb, mrb_value str0)
const char *p = RSTRING_PTR(str0);
mrb_int len = RSTRING_LEN(str0);
check_null_byte(mrb, str0);
- if (RSTR_EMBEDDABLE_P(len)) {
- s = str_init_embed(mrb_obj_alloc_string(mrb), p, len);
- }
- else {
- s = str_init_normal(mrb, mrb_obj_alloc_string(mrb), p, len);
- }
+ s = str_init_modifiable(mrb, mrb_obj_alloc_string(mrb), p, len);
return RSTR_PTR(s);
}

string.c: remove code duplication using `str_init_modifiable()`.