public static string FindExecutableInPath()

in src/Amazon.Lambda.Tools/LambdaDotNetCLIWrapper.cs [422:476]
47 lines of code
14 McCabe index (conditional complexity)

        public static string FindExecutableInPath(string command)
        {

            if (File.Exists(command))
                return Path.GetFullPath(command);

#if NETCOREAPP3_1_OR_GREATER
            if (string.Equals(command, "dotnet.exe"))
            {
                if(!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                {
                    command = "dotnet";
                }

                var mainModule = Process.GetCurrentProcess().MainModule;
                if (!string.IsNullOrEmpty(mainModule?.FileName)
                    && Path.GetFileName(mainModule.FileName).Equals(command, StringComparison.OrdinalIgnoreCase))
                {
                    return mainModule.FileName;
                }
            }
#endif

            Func<string, string> quoteRemover = x =>
            {
                if (x.StartsWith("\""))
                    x = x.Substring(1);
                if (x.EndsWith("\""))
                    x = x.Substring(0, x.Length - 1);
                return x;
            };

            var envPath = Environment.GetEnvironmentVariable("PATH");
            if (envPath != null)
            {
                foreach (var path in envPath.Split(Path.PathSeparator))
                {
                    try
                    {
                        var fullPath = Path.Combine(quoteRemover(path), command);
                        if (File.Exists(fullPath))
                            return fullPath;
                    }
                    catch (Exception)
                    {
                        // Catch exceptions and continue if there are invalid characters in the user's path.
                    }
                }
            }

            if (KNOWN_LOCATIONS.ContainsKey(command) && File.Exists(KNOWN_LOCATIONS[command]))
                return KNOWN_LOCATIONS[command];

            return null;
        }