How to remove all whitespace characters from a string in Kotlin

How to remove all whitespace characters from a string in Kotlin.

Here's a step-by-step tutorial on how to remove all whitespace characters from a string in Kotlin:

Start by creating a Kotlin project or open an existing one in your preferred IDE.
In your Kotlin file, declare a string variable that contains the string from which you want to remove whitespace characters. For example:
```
val inputString = "Hello,  Kotlin!"
```
In this example, the input string is "Hello, Kotlin!", which contains spaces between the words.
To remove all whitespace characters from the string, you can use the replace function with the regular expression \s+. This regular expression matches one or more whitespace characters.
```
val result = inputString.replace("\\s+".toRegex(), "")
```
The replace function replaces all occurrences of the regular expression with an empty string, effectively removing the whitespace characters.
Print the result to verify that the whitespace characters have been removed.
```
println(result)
```
When you run the program, the output will be:
```
Hello,Kotlin!
```
As you can see, all whitespace characters have been removed from the original string.

Alternatively, if you want to modify the original string in-place, you can use the replace function with the StringBuilder class. Here's an example:

val inputString = StringBuilder("Hello,  Kotlin!")
inputString.replace("\\s+".toRegex(), "")

In this case, the replace function modifies the StringBuilder object directly, removing the whitespace characters from the original string.

That's it! You've successfully removed all whitespace characters from a string in Kotlin. You can apply these techniques to any string that requires whitespace removal.