Passing a filepath to fopen from an Array Fails in C - c

Question

I have a two filepaths input by the user and stored in an array. However, when I try to use one of these filepaths to open a file using fopen the code exits as if the file does not exist. If I hard code the filepath into the fopen function eveything proceeds perfectly.
For Example:
//Libraries
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
//Global Functions
//Main Function
int main()
{
//Local Variables
char * user_input_full = NULL;
char user_input = 'a';
size_t len = 0; //Pointer for user_input_full
int size = 0; //Length of the input_use_full array
char *input_array[2]; //This hold the filepaths
int i=0; //A loop counter
//Carve out an initial array for the use input string (it is of unknown length)
user_input_full = calloc(16,sizeof(char));
size = 16;
//Take user input until a newline is encountered.
while(user_input != '\n')
{
scanf("%c", &user_input);
user_input_full[len] = user_input;
len = len+1;
if(len==size)
{
#ifdef DEBUG_MODE
printf("The input stream is being reallocated\n");
#endif
user_input_full = realloc(user_input_full,sizeof(char)*(size+16));
if(user_input_full == NULL)
{
//realloc failed, return a fail status
printf("Realloc of the input stream failed.\n");
return EXIT_FAILURE;
}
}
}
user_input_full[len] = '\0';
#ifdef DEBUG_MODE
printf("The user input was: %s \n", user_input_full);
#endif
//Parse out the file streams
input_array[i] = strtok(user_input_full," ");
while(input_array[i]!=NULL)
{
input_array[++i] = strtok(NULL," ");
}
#ifdef DEBUG_MODE
printf("Input array Values:\n");
for (i=0;i<2;i++)
{
printf("%s \n",input_array[i]);
}
#endif
//open the file specified in input_array[0]
if(fopen(input_array[0],"r") == NULL)
{
printf("Open of the input file failed.\n");
printf("Tried to open: %s ", input_array[0]);
return EXIT_FAILURE;
}
else
{
printf("The file opened.\n");
}
return EXIT_SUCCESS;
}
Would print the error block. However:
//Open the file specified in array[0]
if(fopen("test.txt","r") == NULL)
{
printf("Failed to open the input file.\n");
return EXIT_FAILURE;
}
else
{
printf("The file opened.\n");
}
Works perfectly fine.
I also tried passing the value in input_array[0] to a const char*, but that did not work either. I feel like I am missing some fundamental concept here.
EDIT: Clarified one of the comments in the code block

Answer 1

The real reason it is failing is due to trailing newline in the filename. All you need is to add newline as string token.
Change this line:
input_array[i] = strtok(user_input_full," ");
to:
input_array[i] = strtok(user_input_full," \n");
and this line:
input_array[++i] = strtok(NULL," ");
to:
input_array[++i] = strtok(NULL," \n");
This will remove the trailing newlines.

Answer 2

First mistake I note is in the following code block. it's inputing 3 three strings to input_array and going out of bound.
//Parse out the file streams
input_array[i] = strtok(user_input_full," ");
while(input_array[i]!=NULL)
{
input_array[++i] = strtok(NULL," ");
}
Change this code block to something as shown here.
input_array[i] = strtok(user_input_full," ");
for(i=1;i<2;i++)
{
input_array[i] = strtok(NULL," ");
}