Replace all evil space characters in a string with a specified character.
These characters are not visible in the string, but they are present in the string.
In many cases, these characters are pretending to be spaces or even hidden themselves,
which make program malfunction.
Parameters
str: string
The string to process
to: string = ''
The character to replace evil spaces with (default is an empty string)
Replace all evil space characters in a string with a specified character.