get rid of macro, use inline func

include/utils.hpp

@@ -7,16 +7,7 @@
 
 #define FILL_CHAR ' '
 
-// wrapper around readFile func
-#define fastReadNum(path, val) readFile(path, buf, sizeof(buf)); val = std::strtoll(buf, NULL, 10)
-
-enum JUST {
-  RIGHT,
-  LEFT
-};
-
-// pretty prints num with given decs, 0 by default. its basically a macro so we inline it
-inline std::string pNum(auto num, uint8_t decs = 0) { return std::format("{:.{}f}", num, decs); }
+enum JUST { RIGHT, LEFT };
 
 std::string pad(std::string s, uint8_t len, JUST j = JUST::RIGHT);
 std::string center(std::string str, uint8_t len);
@@ -25,4 +16,15 @@ ssize_t readFile(std::string path, char* buffer, size_t maxlen);
 ssize_t readFile(const char* path, char* buffer, size_t maxlen);
 std::string getFirstDir(std::string_view path);
 
+template <size_t N>
+inline long long fastReadNum(const std::string& path, char (&buf)[N]) {
+    readFile(path, buf, N);
+    return std::strtoll(buf, nullptr, 10);
+}
+
+// pretty prints num with given decs, 0 by default. its basically a macro so we inline it
+inline std::string pNum(auto num, uint8_t decs = 0) {
+    return std::format("{:.{}f}", num, decs);
+}
+
 #endif