code: private String getOsName() {
          // windows
          if (OS_NAME.contains("win")) {
              boolean is64bit = (System.getenv("ProgramFiles(x86)") != null);
              return "windows_" + (is64bit ? "x86_64" : "x86");
          } else if (OS_NAME.contains("mac")) {
              // mac osx
              return "mac_" + OS_ARCH;
          } else if (OS_NAME.contains("nix") || OS_NAME.contains("nux") || OS_NAME.indexOf("aix") > 0) {
              // unix
              return "amd64".equalsIgnoreCase(OS_ARCH) ? "linux_x86_64" : "linux_" + OS_ARCH;
          } else {
              throw new WebpIOException("Hi boy, Your OS is not support!!");
          }
      }
docs: get os name and arch
  
  @return