When working with strings that will be used as URLs or filenames, it's essential to ensure they are formatted correctly. This includes replacing spaces, handling special characters, and removing any unnecessary underscores. In this post, we'll explore how to accomplish this in Java using a custom function. Why Clean Up URLs? URLs often contain spaces and special characters that can cause issues when used in web applications. For example, spaces may need to be replaced with underscores, and special characters might need to be removed or replaced to ensure the URL is valid. Additionally, consecutive underscores or trailing underscores should be removed to maintain a clean and professional appearance. Step-by-Step Approach Let's start by looking at a string that needs cleaning: String url = "18\" IPC IMOP XL COMPACT AUTOSCRUBBER LITHIUM BATT MEDIUM BLUE BRUSHES_prdcode_3768_l_prdcode_3766_l_18in_imop.png"; This string contains spaces, specia