Write a C function, which reverses a given string and returns a pointer to reversed string.char *reverse(char *str);

Sure, here is a simple implementation of a C function that reverses a given string and returns a pointer to the reversed string:

#include <string.h>
#include <stdlib.h>

char *reverse(char *str) {
    int len = strlen(str);
    char *rev = malloc(len + 1);

    for(int i = 0; i < len; i++) {
        rev[i] = str[len - 1 - i];
    }

    rev[len] = '\0';
    return rev;
}

This function works by first determining the length of the input string str with strlen(). It then allocates memory for the reversed string rev with malloc(). The size of the allocated memory is len + 1 to account for the null terminator at the end of the string.

The function then enters a loop that iterates over the characters in str in reverse order. For each character, it assigns the corresponding character in rev.

Finally, the function adds a null terminator at the end of rev and returns it.