Write a complete C program which must: Implement the function void swapChars(char* str) which receives a string (array of characters) and modifies the string by swapping its first n/2 characters with its last n/2 characters. Examples: 1234567 becomes 5674123 aabb becomes bbaa aabcc becomes ccbaa AhmadAlami becomes AlamiAhmad This function does not print anything. Read from the user (in main()) a string and then print the string after calling function swapChars appropriately. Use pointers and pointer arithmetic only. The use of array notation and/or functions from the string.h library is not allowed.