String in-built Manipulations (part-1) using C language

String in-built Manipulations (part-1) using C language#include <stdio.h>#include <stdlib.h>#include <string.h>    //you must use this Pre-processor to do this in-built Manipulationsint main(void) { //String concatenate char str[]="hello"; char str1[]="world"; strcat(str,str1); printf("concatenated string --> %s",str); //string concatenate based on size char str2[]="hello"; char...