fix multiple slashes in urls generated from user input

FixUrlUnitTest.java

public class CleanUserInputUnitTests{
  
  private static final Pattern HAS_MORE_THAN_SINGLE_SLAHES_PATTERN = Pattern.compile("([^:])\\/+");
  
  @Test
  public void regexPatternForRemovingSlashesFromBadUrlsWorksCorrectly() {
    String input = "https://www.google.com//we////super///love/slashes//////in//generated/urls";
    String expectedOutput = "https://www.google.com/we/super/love/slashes/in/generated/urls";

    Assert.assertEquals(Pattern.compile(HAS_MORE_THAN_SINGLE_SLAHES_PATTERN).matcher(input).replaceAll("$1/"), expectedOutput);
  }
  
}