use pointers to strings

src/cpu.cpp

@@ -7,7 +7,7 @@
 
 namespace cpu {
 
-void detectHwmon(cpuSensors* target, std::string pci) {
+void detectHwmon(cpuSensors* target, const std::string& pci) {
     std::string path = "/sys/bus/pci/devices/" + pci + "/hwmon";
 
     try {

src/gpu.cpp

@@ -10,7 +10,7 @@
 namespace gpu {
 
 /* takes pointer to a target gpu::sensors struct and updates its hwmon path and detects gpu_metrics */
-void detectHwmon(gpuSensors* target, std::string pci) {
+void detectHwmon(gpuSensors* target, const std::string& pci) {
     target->hwmon = getFirstDir("/sys/bus/pci/devices/" + pci + "/hwmon");
     log(LOG::INF, "gpu::detectHwmon", "Detected path \"{}\"", target->hwmon);