diff --git a/src/console_input.cc b/src/console_input.cc
index a284db2..f56ffa5 100644
--- a/src/console_input.cc
+++ b/src/console_input.cc
@@ -5,17 +5,6 @@
 console_input::console_input(std::istream &cin):
         in{cin} {}
 
-inline game_command get_direction(std::string &str, const char *COMMANDS[],
-                                  const int COMMANDS_CNT) {
-        for (int i = 0; i < COMMANDS_CNT; ++i)
-                if (str == COMMANDS[i] &&
-                    i >= game_command::move_north &&
-                    i <= game_command::move_southeast)
-                        return (game_command)i;
-
-        return game_command_panic;
-}
-
 game_command console_input::get_command() {
         const char *COMMANDS[] = {
                 "q", "no", "so", "ea", "we", "ne", "nw", "se", "sw", "u", "a"
diff --git a/src/file_input.cc b/src/file_input.cc
index 9980646..2fb83d6 100644
--- a/src/file_input.cc
+++ b/src/file_input.cc
@@ -5,17 +5,6 @@
 file_input::file_input(std::ifstream &&ifs):
         in{std::move(ifs)} {}
 
-inline game_command get_direction(std::string &str, const char *COMMANDS[],
-                                  const int COMMANDS_CNT) {
-        for (int i = 0; i < COMMANDS_CNT; ++i)
-                if (str == COMMANDS[i] &&
-                    i >= game_command::move_north &&
-                    i <= game_command::move_southeast)
-                        return (game_command)i;
-
-        return game_command_panic;
-}
-
 game_command file_input::get_command() {
         const char *COMMANDS[] = {
                 "q", "no", "so", "ea", "we", "ne", "nw", "se", "sw", "u", "a"
diff --git a/src/input.cc b/src/input.cc
new file mode 100644
index 0000000..d5636ee
--- /dev/null
+++ b/src/input.cc
@@ -0,0 +1,12 @@
+#include "input.h"
+
+game_command get_direction(std::string &str, const char *COMMANDS[],
+                           const int COMMANDS_CNT) {
+        for (int i = 0; i < COMMANDS_CNT; ++i)
+                if (str == COMMANDS[i] &&
+                    i >= game_command::move_north &&
+                    i <= game_command::move_southeast)
+                        return (game_command)i;
+
+        return game_command_panic;
+}
diff --git a/src/input.h b/src/input.h
index 51148a9..c47cc4d 100644
--- a/src/input.h
+++ b/src/input.h
@@ -1,5 +1,6 @@
 #ifndef __INPUT_H__
 #define __INPUT_H__
+#include <string>
 #include "constants.h"
 
 class input {
@@ -8,4 +9,7 @@ public:
         virtual game_command get_command() = 0;
 };
 
+game_command get_direction(std::string &str, const char *COMMANDS[],
+                           const int COMMANDS_CNT);
+
 #endif