[util.go] Optimisation by comparing high part of byte to 3 (numbers in ASCII are going from 0x30 to 0x39). And convert the whole number only if it is PID we are looking for.

util.go

@@ -16,14 +16,14 @@ func GetProcessPIDs(name string) ([]int, error) {
 	}
 
 	for _, entry := range dir {
-		pid, err := strconv.Atoi(entry.Name())
-		if entry.IsDir() && err == nil {
-			f, err := os.ReadFile("/proc/" + entry.Name() + "/cmdline")
+		if entry.IsDir() && entry.Name()[0]>>0x4&0xf == 0x3 {
+			cmdline, err := os.ReadFile("/proc/" + entry.Name() + "/cmdline")
 			if err != nil {
 				return nil, err
 			}
 
-			if strings.Contains(string(f), name) {
+			if strings.Contains(string(cmdline), name) {
+				pid, _ := strconv.Atoi(entry.Name())
 				pids = append(pids, pid)
 			}
 		}