Commit aad3f79

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[C++] added 3 snippets for string.

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	`1`	`+---`
	`2`	`+title: Filter`
	`3`	`+description: Filter a string with a predicate function`
	`4`	`+author: majvax`
	`5`	`+tags: cpp,string,utility,filtering`
	`6`	`+---`
	`7`	`+`
	`8`	+```cpp
	`9`	`+#include <ranges>`
	`10`	`+#include <string>`
	`11`	`+`
	`12`	`+template <typename P>`
	`13`	`+std::string filter(const std::string& str, P&& predicate) {`
	`14`	`+ return str`
	`15`	`+ \| std::ranges::views::filter(std::forward<P>(predicate))`
	`16`	`+ \| std::ranges::to<std::string>();`
	`17`	`+}`
	`18`	+```

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	`1`	`+---`
	`2`	`+title: Palindrome`
	`3`	`+description: Check if a string is a palindrome or not.`
	`4`	`+author: majvax`
	`5`	`+tags: cpp,string,utility`
	`6`	`+---`
	`7`	`+`
	`8`	+```cpp
	`9`	`+#include <string>`
	`10`	`+#include <ranges>`
	`11`	`+#include <algorithm>`
	`12`	`+`
	`13`	`+bool is_palindrome(const std::string& str) {`
	`14`	`+ std::string sanitized_string = str`
	`15`	`+ \| std::ranges::views::filter([](char c){ return std::isalnum(c); })`
	`16`	`+ \| std::ranges::views::transform([](char c){ return std::tolower(c); })`
	`17`	`+ \| std::ranges::to<std::string>();`
	`18`	`+`
	`19`	`+ return std::ranges::equal(sanitized_string, sanitized_string \| std::views::reverse);`
	`20`	`+}`
	`21`	+```

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	`1`	`+---`
	`2`	`+title: Transform`
	`3`	`+description: Transform a string with a function`
	`4`	`+author: majvax`
	`5`	`+tags: cpp,string,utility,transform`
	`6`	`+---`
	`7`	`+`
	`8`	+```cpp
	`9`	`+#include <ranges>`
	`10`	`+#include <string>`
	`11`	`+`
	`12`	`+template <typename F>`
	`13`	`+std::string transform(const std::string& str, F&& transformer) {`
	`14`	`+ return str`
	`15`	`+ \| std::ranges::views::transform(std::forward<F>(transformer))`
	`16`	`+ \| std::ranges::to<std::string>();`
	`17`	`+}`
	`18`	+```

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