Move runtime stuff to own file

Author: gyuheon0h

.gitignore

@@ -58,4 +58,4 @@ lib/*.so
 # Benchmark result files
 /benchmarks/*.json
 
-my-libdatadog-build/
+debug_runtime_callback.rb

debug_runtime_callback.rb

@@ -41,6 +41,13 @@ static inline ddog_CharSlice char_slice_from_ruby_string(VALUE string) {
   return char_slice;
 }
 
+static inline ddog_CharSlice char_slice_from_cstr(const char *cstr) {
+  if (cstr == NULL) {
+    return (ddog_CharSlice){.ptr = NULL, .len = 0};
+  }
+  return (ddog_CharSlice){.ptr = cstr, .len = strlen(cstr)};
+}
+
 static inline VALUE log_warning(VALUE warning) {
   VALUE datadog_module = rb_const_get(rb_cObject, rb_intern("Datadog"));
   VALUE logger = rb_funcall(datadog_module, rb_intern("logger"), 0);