Write a function printTriangle that takes a single int argument and prints a right-triangled-shaped
star pattern with as many rows as the argument.
For example, when the argument is 3 you should print the pattern:
*
**
***
When the argument is 4, you should print:
*
**
***
****
If the argument is 0 or less, print nothing.
Remember, you can use System.out.print to print without creating a new line.
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