Thread: modify char array in function || reading lines from file

I read in file with four columns skipping line one. File is tab/space delimited, my goal is to get the last column.

I use function where parameter is char array. The function is OK as long it is working, however, it doesn't move the pointer of Char array to new location.

I cannot understand why. Or, how to move char pointer to location. It prints complete line as 1 startcoord, end coord and gene.

In the function, the gene name is printed fine, that is pointer is moved correctly.

Code:

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


#include "funcs_combinations.h"


#define MAX_LEN 200


void get_gene_name(char temp_line[])
{
    int space_count = 0; //get location of last space
    size_t itr = 0; //iterate
    size_t len_line = strlen(temp_line);


    while (itr < len_line)
    {
        if ((temp_line)[itr] == ' ' || (temp_line)[itr] == '\t')
        {
            space_count = itr; //store space location
        }
        itr++;
    }
    printf("space location was %d\n", space_count);
    temp_line = space_count + temp_line; //move pointer 
    printf("moved location is %d\n", temp_line);
    printf("location is %s\n", temp_line); //printing works fine here but goes bad in returning
    // return (temp_line);
}
//////////////////////////////


void remove_trailingspaces(char *newlines)
{


/*
This function is called while reading the first line


*/
    size_t length = strlen(newlines);
    size_t i = 0;
    for (i = 0; i < length; i++)
    {
        if (newlines[i] == '\n')
        {
            newlines[i - 1] = '\0';
            break;
        }
    }
}




//////////////////////////////
int main(int argc, char *argv[])
{
    FILE *fptr;
    char c[MAX_LEN];
    int line_number = 0;


    fptr = fopen(argv[1], "r");


    if (fptr == NULL)
    {
        printf("null pointer for file opening\n");
    }


    while (fgets(c, MAX_LEN, fptr))
    {
        if (line_number > 1) //make sure header is read 
        {
            if (strcmp(c, "\n") != 0)
            {
                remove_trailingspaces(c);
                get_gene_name(c);
                printf("new gene is %s\n", c); // it doesn't move to new location 
                add_node(&start, c); //only if not new line
            }
        }


        line_number++;
    }


    fclose(fptr);


    return 0;
}

I have input file with lines as:

CHR START END GENE
1 1234 546 GENE1
1 2234 5346 GENE12
1 4234 5246 GENE14
1 6234 5546 GENE16

I want to get last column, that is gene name. GENE1, GENE12 and such from function get_gene_name.
Edit: itr for get_gene_name (while loop )