Improve and beautify getDecodedFileName method

[MohitMaliFtechiz]

Describe the bug Currently method is written as

getDecodedFileName(url: String?, src: String?): String =
    url?.substringAfterLast("/", "")
      ?.takeIf { it.contains(".") }
      ?: src?.substringAfterLast("/", "")
        ?.substringAfterLast("%3A") ?: ""

Expected behavior We can beautify and improve this piece of method code.