I think the problem is with this line:
System.setProperty("webdriver.gecko.driver", "C:\Users\KSaraswathiChowdary\Documents\softwares\geckodriver-v0.24.0-win64.exe");
Backslashes (\) are used for escape sequence. Try this:
System.setProperty("webdriver.gecko.driver", "C:\\Users\\KSaraswathiChowdary\\Documents\\softwares\\geckodriver-v0.24.0-win64.exe");