Code compiles and passes tests without NO_STDLIB define

const_fmt/format_impl.h

@@ -12,6 +12,7 @@
 
 #include <stdint.h>
 
+#include "std_lib.h"
 #include "utility.h"
 
 

const_fmt/std_lib.h

@@ -5,6 +5,7 @@
 #ifndef CONST_FMT_NO_CPP_STD_LIB
 
 #include <array>
+#include <cstring>
 
 #else
 

const_fmt/types.h

@@ -20,8 +20,7 @@ template <std::size_t N>
 class ConstString {
 public:
     constexpr ConstString(const char (&content)[N]) noexcept {
-        std::copy(&content[0], (&content[N-1] + 1),
-                  m_content.begin());
+        std::copy(&content[0], (&content[N - 1] + 1), m_content.begin());
     }
 
     constexpr char operator[](std::size_t index) const noexcept {