feat(Week01): Add solutions

1 files changed, 74 insertions, 0 deletions

diff --git a/Week01/Exercise03/stringHelpers.cpp b/Week01/Exercise03/stringHelpers.cpp
new file mode 100644
index 0000000..ee9e691
--- /dev/null
+++ b/Week01/Exercise03/stringHelpers.cpp
@@ -0,0 +1,74 @@
+#include "stringHelpers.h"
+
+char* newString(unsigned length) {
+	return new char[length + 1];
+}
+
+// Тази функция е локална: не можем да я използваме в друг файл!
+unsigned stringLength(const char* string) {
+	if (string == nullptr)
+		return 0;
+
+	unsigned length = 0;
+
+	while (*string != '\0') {
+		++length;
+		++string;
+	}
+
+	return length;
+}
+
+char* newString(const char* string) {
+	if (string == nullptr)
+		return nullptr;
+
+	unsigned length = stringLength(string);
+
+	char* str = newString(length);
+
+	// Правим <= length, за да пренесем и терминиращата нула
+	for (unsigned i = 0; i <= length; ++i) {
+		str[i] = string[i];
+	}
+
+	return str;
+}
+
+char* concatStrings(const char* first, const char* second, const char* separator) {
+	unsigned length = stringLength(first) + stringLength(separator) + stringLength(second);
+
+	char* str = newString(length);
+	unsigned i = 0;
+
+	if (first != nullptr) {
+		while (*first != '\0' && i < length) {
+			str[i] = *first;
+			++first;
+			++i;
+		}
+	}
+
+	if (separator != nullptr) {
+		while (*separator != '\0' && i < length) {
+			str[i] = *separator;
+			++separator;
+			++i;
+		}
+	}
+
+	if (second != nullptr) {
+		while (*second != '\0' && i < length) {
+			str[i] = *second;
+			++second;
+			++i;
+		}
+	}
+
+	return str;
+}
+
+void deleteString(char*& string) {
+	delete[] string;
+	string = nullptr;
+}