Algoexpert Caesar Cipher Encryptor.java

	import java.util.*;
	class Program {
	// O(n) T | O(n) S
	public static String caesarCypherEncryptor(String str, int key) {
	// handle corner cases
	if (str == null || str.length() == 0) {
	return str;
	}
	int n = str.length();
	char[] encoded = new char[n];
	for (int i = 0; i < n; i++) {
	encoded[i] = getNewChar(str.charAt(i), key);
	}
	return new String(encoded);
	}
	private static char getNewChar(char oldChar, int key) {
	return (char)('a' + (oldChar - 'a' + key) % 26);
	}
	}

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