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This tutorial demonstrates how to remove spaces and dashes from a string, specifically focused on a credit card number. The process involves iterating through each character in the string, checking if it is a space or dash, and removing it if so. The code snippet uses a while loop with an index variable to traverse the string efficiently. By using the substring method, the characters before and after the space or dash are concatenated to create the final cleaned credit card number. If the character is not a space or dash, the loop simply continues to the next character.