Write a `subString()` function - c

Question

Write a function called subString() to extract a portion of a character string. The function should be called as follows
subString (source, start, count, result);
Where source is the character string from which you are extracting the substring, start is an index number into source indicating the first character of the substring, count is the number of characters to be extracted from the source string, and result is an array of characters that is to contain the extracted substring.
Here is what I have so far. I'm getting a weird result when I run the program
#include <stdio.h>
char substring (char source[], int start, int count, char result[])
{
int i;
source[start] = result [0]; // set the initial value of the result array to the value of the source array at the point of 'start'
for (i = 1; i <= count; i++, start++) { // keep adding to start until 'result' has obtained all the values it was supposed to get from the source array
source[start] = result[i];
}
result [count+1] = '\0'; // adds a null terminator to the end of the resultant string
return *result;
}
int main (void)
{
char source [] = "Any help would be appreciated. I dont know where I've gone wrong"; // define a generic string for the user to extract a string from
int start = 0, count = 0;
char result [255];
// allows for multiple different calls to be made without having to adjust the code every time
printf("%s",source);
printf("\n\nAt what point in the above statement should extracting begin? "); // assigns a starting point
scanf("%d", &start);
printf("\n\nHow many characters do you want to extract? "); // sets a number of characters to extract
scanf("%d", &count);
substring (source, start, count, result); // call the substring function
printf("\n\nThe resultant string, after extraction is: %s\n\n", substring); // print the result of the subString function
return 0;
}

Answer 1

This is an organized enumeration of problems with your code
You are passing the function name to printf(). Which indicates that it was a bad function name choice, you should pass result instead of substring.
You are returning only the first character of result in the substring() function.
Your function is using the uninitialized array result as the source string, which is incorrect, you need to copy the string from source to result instead.
This is a suggestion
char *substring (char *source, int start, int count, char *result)
{
int i;
for (i = 0 ; ((i < start) && (source[i] != '\0')) ; i++)
result[i] = source[i];
for ( ; source[i + count] != '\0' ; i++)
result[i] = source[i + count];
result[i] = '\0';
return result;
}
i think it's easy to understand what this function does.
VERY IMPORTANT: In c arrays are indexed from 0 to N - 1 so be careful with for loops.

Answer 2

I got it to work, using some of the help from above, but also with a good amount of my own thinking. Thanks for the help everybody
#include <stdio.h>
char *substring (char *source, int start, int count, char *result)
{
int i;
for (i = 0 ; i < (count) ; i++)
result[i] = source[i + start]; // after hitting start, as long as you're not at the end, the result should match the source
result[i] = '\0';
return result;
}
int main (void)
{
char source [] = "character"; // define a generic string for the user to extract a string from
int start = 0, count = 0;
char result [255];
printf("%s",source);
printf("\n\nAt what point in the above statement should extracting begin? "); // assigns a starting point
scanf("%d", &start);
printf("\n\nHow many characters do you want to extract? "); // sets a number of characters to extract
scanf("%d", &count);
substring (source, start, count, result);
printf("\n\nThe resultant string, after extraction is: %s\n\n", result); // calling result, not the whole function
return 0;
}