adding back files to be reviewed

include/openmc/string_utils.h

@@ -0,0 +1,26 @@
+#ifndef OPENMC_STRING_UTILS_H
+#define OPENMC_STRING_UTILS_H
+
+#include <string>
+#include <vector>
+
+namespace openmc {
+
+std::string& strtrim(std::string& s);
+
+char* strtrim(char* c_str);
+
+std::string to_element(const std::string& name);
+
+void to_lower(std::string& str);
+
+int word_count(std::string const& str);
+
+std::vector<std::string> split(const std::string& in);
+
+bool ends_with(const std::string& value, const std::string& ending);
+
+bool starts_with(const std::string& value, const std::string& beginning);
+
+} // namespace openmc
+#endif // OPENMC_STRING_UTILS_H