Custom String Library

This project implements essential string manipulation functions in C from scratch.

🛠️ Functions Implemented

1. SUBSTRING: Extracts a portion of a string based on a start index and length.
   • "yazilimcilar", 3, 4 $\to$ "ilim"
2. UPPER: Converts all lowercase characters to uppercase.
   • "yazilim" $\to$ "YAZILIM"
3. LOWER: Converts all uppercase characters to lowercase.
   • "YAZILIM" $\to$ "yazilim"
4. REVERSE: Reverses the character order of the string in-place.
   • "ABC" $\to$ "CBA"

🚀 Example Output

Based on Question 10:

1. SUBSTRING (3, 4): ilim
2. UPPER: YAZILIMCILAR
3. LOWER: yazilimcilar
4. REVERSE: 4321CBA