01-ReverseString | 02-BracketChecker | 03-SubstringCount | 04-UpCaseLowerCase | 05-nbsp | 06-ExtractText | 07-ParseURL | 08-BBCode | 09-ExtractEmail | 10-Palindrome | 11-StringFormat | 12-Templates

// 11. Write a function that formats a string using placeholders: