How to get rid of empty characters from the string?

I am reading the location for a file from local HDD which is dynamically created from a local host. I have managed to read the output from batch file but the issue is when i am reading for the location it is also including special characters I want to get rid of these character.

So far I have tried following approaches:
→ converting string to character array, eaxtracting only the LettersAndNumbers with ‘.’ and ‘_’ symbols
→ splitting string: path.Split (spC, 7,StringSplitOptions.RemoveEmptyEntries);
→ trying to read from lsat of the string till ‘/’ and then reversing the extracted char array and copying it to string.

But nothing seems to work here…

Please help me out here ;'(

You can see the invalid character is not showing up in debug log.
Further you can see the upload_randomstring.jpg and then __ends in the new line that is the split string.
I wouldn’t have got to know what this evil character (%00%) if not for Uri.EscapeUriString(…) class.

add for www:file:///C:/Users/shubh/AppData/Local/Temp/upload_c33e4a116d8034a032f8a251d7ea5656.jpg%00%00%00%00%00%00%00

Finally got it working, but I still don’t get it why my previous code wasn’t working for omitting the special character.

Here is how I was doing it before:

char[] fnca = fileName.ToCharArray ();
		char[] validC = new char[50];
		int vc = 0;
		for (int i = 0; i < fnca.Length; i++) {
			if (Char.IsLetterOrDigit (fnca <em>) || fnca  <em>== '_' || fnca  *== '.') {*</em></em>

_ //UnityEngine.Debug.Log (fnca );
validC [vc] = fnca ;
* vc++;
if (fnca == ‘.’) {
validC [vc] = ‘j’;vc++;validC [vc] = ‘p’;vc++;validC [vc] = ‘g’;vc++;
i = fnca.Length + 2;

UnityEngine.Debug.Log ("Invalid char: " + fnca );
* }
validC [vc] = ‘\0’;
fileNameNew = new string (validC);
Later I used stringbuilder class for formatting the string and this worked:
string RemoveSpecialCharacters(string str) {
StringBuilder sb = new StringBuilder();
foreach (char c in str) {_

if ((c >= ‘0’ && c <= ‘9’) || (c >= ‘A’ && c <= ‘Z’) || (c >= ‘a’ && c <= ‘z’) || c == ‘.’ || c == '’ || c==‘\’ || c==‘:’) {*
* sb.Append(c);
return sb.ToString();

Some peace. Would still appreciate if anyone could find the underlying issue here._