opening files using mimetypes defined in config.h

backend.c

@@ -14,6 +14,14 @@ extern unsigned int file_modifiers;
 extern unsigned int color_count;
 extern color *colors;
 
+char* concat(const char *s1, const char *s2){
+    const size_t len1 = strlen(s1);
+    const size_t len2 = strlen(s2);
+    char *result = malloc(len1 + len2 + 1);
+    memcpy(result, s1, len1);
+    memcpy(result + len1, s2, len2 + 1);
+    return result;
+}
 
 unsigned long get_dir_size(char *path){
 	DIR *dir = opendir(path);