Add missing header

include/rtg/stringutils.hpp

+#ifndef GUARD_RTGLIB_STRINGUTILS_HPP
+#define GUARD_RTGLIB_STRINGUTILS_HPP
+
+#include <algorithm>
+#include <numeric>
+#include <string>
+
+namespace rtg {
+
+inline std::string
+replace_string(std::string subject, const std::string& search, const std::string& replace)
+{
+    size_t pos = 0;
+    while((pos = subject.find(search, pos)) != std::string::npos)
+    {
+        subject.replace(pos, search.length(), replace);
+        pos += replace.length();
+    }
+    return subject;
+}
+
+inline bool ends_with(const std::string& value, const std::string& suffix)
+{
+    if(suffix.size() > value.size())
+        return false;
+    else
+        return std::equal(suffix.rbegin(), suffix.rend(), value.rbegin());
+}
+
+template <class Strings>
+inline std::string join_strings(Strings strings, std::string delim)
+{
+    auto it = strings.begin();
+    if(it == strings.end())
+        return "";
+
+    auto nit = std::next(it);
+    return std::accumulate(
+        nit, strings.end(), *it, [&](std::string x, std::string y) { return x + delim + y; });
+}
+
+template <class F>
+inline std::string transform_string(std::string s, F f)
+{
+    std::transform(s.begin(), s.end(), s.begin(), f);
+    return s;
+}
+
+inline std::string to_upper(std::string s) { return transform_string(std::move(s), ::toupper); }
+
+inline bool starts_with(const std::string& value, const std::string& prefix)
+{
+    if(prefix.size() > value.size())
+        return false;
+    else
+        return std::equal(prefix.begin(), prefix.end(), value.begin());
+}
+
+inline std::string remove_prefix(std::string s, std::string prefix)
+{
+    if(starts_with(s, prefix))
+        return s.substr(prefix.length());
+    else
+        return s;
+}
+
+} // namespace rtg
+
+#endif
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