2 files changed, 14 insertions, 8 deletions
diff --git a/src/utils/tolower.cpp b/src/utils/tolower.cpp
new file mode 100644
index 0000000..3e518bd
--- /dev/null
+++ b/src/utils/tolower.cpp
@@ -0,0 +1,13 @@
+#include <utils/tolower.hpp>
+
+namespace utils
+{
+  std::string tolower(const std::string& original)
+  {
+    std::string res;
+    res.reserve(original.size());
+    for (const char c: original)
+      res += static_cast<char>(std::tolower(c));
+    return res;
+  }
+}
diff --git a/src/utils/tolower.hpp b/src/utils/tolower.hpp
index 22d2b8f..0019182 100644
--- a/src/utils/tolower.hpp
+++ b/src/utils/tolower.hpp
@@ -5,14 +5,7 @@
 
 namespace utils
 {
-  std::string tolower(const std::string& original)
-  {
-    std::string res;
-    res.reserve(original.size());
-    for (const char c: original)
-      res += static_cast<char>(std::tolower(c));
-    return res;
-  }
+  std::string tolower(const std::string& original);
 }
 
 #endif // SPLIT_INCLUDED